| In millions, except per share items | Jul-29-17 | Apr-29-17 | Jan-28-17 | Oct-29-16 | Jul-30-16 | Apr-30-16 | Jan-30-16 | Oct-31-15 |
| | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K |
| Cash flows from operating activities: | | | | | | | | |
| Net income (loss) | 30.3 | 60.3 | 114.4 | 213.9 | 231.6 | 312.8 | 346.7 | 340.4 |
| Adjustments to reconcile net income (loss) to net cash from operating activities: | | | | | | | | |
| Excess tax benefits from stock-based compensation | -7.9 | -0.9 | -5.7 | -9.6 | -8.7 | -30.4 | -40.2 | -48.9 |
| Depreciation and amortization | 161.7 | 161.2 | 143.4 | 124.3 | 103.2 | 90.4 | 88.0 | 84.8 |
| Loss on disposal of property and equipment | 3.7 | 0.6 | 0.6 | 0.6 | 2.0 | 2.4 | 2.9 | 3.2 |
| Net gain on sale of investments | | | | | -0.1 | | | |
| Amortization of debt issuance costs and debt discount | 21.0 | 20.7 | 19.7 | 18.9 | 17.8 | 17.2 | 17.0 | 13.7 |
| Provision (recovery) for doubtful accounts receivable and sales allowances | 13.1 | 5.6 | 3.2 | 2.2 | -4.0 | -0.6 | 2.7 | 5.2 |
| Non-cash purchase accounting adjustments to inventory | 15.6 | 34.5 | 32.1 | 30.6 | 20.8 | | | |
| Non-cash stock-based compensation expense | 132.0 | 148.2 | 146.8 | 126.3 | 112.7 | 97.2 | 88.5 | 88.5 |
| Changes in assets and liabilities, net of acquisitions and divestitures: | | | | | | | | |
| Accounts receivable | -26.9 | -19.7 | -49.6 | -9.4 | -33.0 | -19.2 | 62.5 | -16.0 |
| Inventories | -8.0 | 1.9 | -5.0 | 3.6 | 5.6 | -5.2 | -5.0 | -1.8 |
| Prepaid expenses and other assets | 1.2 | 10.0 | 2.6 | 7.6 | -4.7 | 8.0 | -9.5 | -15.8 |
| Deferred tax assets | -0.7 | -0.7 | -0.7 | -0.8 | -0.4 | -0.3 | -0.2 | 0.2 |
| Accounts payable | -17.1 | -4.0 | 0.1 | 15.8 | 3.4 | 1.1 | -15.0 | 0.1 |
| Accrued employee compensation | -43.0 | -32.4 | -34.0 | -43.7 | -22.4 | -40.8 | -21.7 | -59.7 |
| Deferred revenue | -54.2 | -27.8 | -16.5 | -28.0 | 20.9 | -1.2 | -10.0 | 1.3 |
| Other accrued liabilities | -45.8 | -66.1 | -55.8 | -40.9 | -10.0 | 30.6 | 43.8 | 50.4 |
| Restructuring liabilities | -0.6 | -0.7 | -0.7 | -1.4 | -1.5 | -2.0 | -2.9 | -2.8 |
| Net cash provided by operating activities | 201.7 | 290.6 | 294.9 | 409.9 | 433.2 | 459.9 | 549.3 | 447.5 |
| |
| Cash flows from investing activities: | | | | | | | | |
| Purchases of non-marketable equity and debt investments | | | | -2.4 | -2.0 | 0.0 | | |
| Proceeds from maturities and sale of short-term investments | | | | | 150.3 | | | |
| Purchases of property and equipment | -45.9 | -54.5 | -65.6 | -77.0 | -75.4 | -77.1 | -76.1 | -68.7 |
| Purchase of intangible assets | | | | | | | | |
| Net cash paid in connection with acquisitions | | | | | -564.9 | 7.9 | | |
| Proceeds from collection of note receivable | | | 0.3 | | | | 0.3 | |
| Net proceeds from sale of software product line | 31.8 | | | | | | | |
| Net cash provided by (used in) investing activities | -14.2 | -461.1 | -482.3 | -493.8 | -491.7 | -87.6 | -171.9 | -172.4 |
| |
| Cash flows from financing activities: | | | | | | | | |
| Payment of principal related to the term loan | -80.0 | -60.0 | -40.0 | -20.0 | | | | |
| Payment of debt issuance costs | | | | -1.2 | -0.9 | | | |
| Payment of principal related to capital leases | | | | -0.3 | -0.4 | -0.7 | -0.7 | -1.8 |
| Common stock repurchases | | | | | -872.6 | -316.3 | -359.2 | -343.7 |
| Proceeds from issuance of common stock | 41.6 | 68.7 | 58.0 | 49.5 | 49.2 | 49.9 | 49.8 | 51.4 |
| Payment of cash dividends to stockholders | -89.5 | -92.1 | -87.7 | -83.8 | -80.4 | -74.1 | -70.8 | -67.5 |
| Proceeds from term loan | | | | | 787.3 | | | |
| Proceeds from convertible notes | | | | | | | | |
| Purchase of convertible note hedge | | | | | | | | |
| Proceeds from issuance of warrants | | | | | | | | |
| Proceeds from noncontrolling interest | | | | | 2.6 | | | |
| Excess tax benefits from stock-based compensation | 7.9 | 0.9 | 5.7 | 9.6 | 8.7 | 30.4 | 40.2 | 48.9 |
| Net cash used in financing activities | -161.6 | 45.3 | 27.4 | -97.8 | -106.5 | -310.9 | -342.0 | -83.7 |
| Effect of exchange rate fluctuations on cash and cash equivalents | 0.5 | -2.7 | -1.8 | -2.1 | -1.5 | -0.6 | -2.7 | -5.6 |
| Net decrease in cash and cash equivalents | 26.3 | -128.0 | -161.8 | -183.8 | -166.6 | 60.8 | 32.6 | 185.9 |
| Cash and cash equivalents, beginning of period | | | 1,257.1 | | | | 1,440.9 | |
| Cash and cash equivalents, end of period | 1,283.4 | 1,129.1 | 1,095.3 | 1,257.1 | 1,274.3 | 1,501.7 | 1,473.5 | 1,440.9 |
| |
| Supplemental disclosures of cash flow information: | | | | | | | | |
| Cash paid for interest | 40.5 | 37.7 | 33.2 | 28.3 | 24.3 | | 23.1 | |
| Cash paid for income taxes | 9.0 | 20.8 | 47.2 | 49.9 | 52.2 | 49.6 | 33.1 | 41.4 |
| Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] | | | | | | | | |