| In millions, except per share items | Jul-01-17 | Apr-01-17 | Dec-31-16 | Sep-24-16 | Jun-25-16 | Mar-26-16 | Dec-26-15 | Sep-26-15 |
| | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
| Cash flows from operating activities: | | | | | | | | |
| Net Income | 15.1 | 17.1 | 19.0 | 20.9 | 18.7 | 14.7 | 12.9 | 10.7 |
| Adjustments to reconcile net income to net cash from operating activities: | | | | | | | | |
| Depreciation and amortization | 3.1 | 3.1 | 3.1 | 3.2 | 3.2 | 3.3 | 3.3 | 3.3 |
| Deferred income taxes | 0.1 | 0.6 | 0.1 | 0.8 | 0.2 | 0.0 | 0.3 | 1.1 |
| Stock-based compensation expense | 1.1 | 1.0 | 0.9 | 0.9 | 0.9 | 0.8 | 0.8 | 0.7 |
| Loss on sale of property, plant and equipment, net | 0.0 | -0.1 | -0.1 | 0.0 | 0.1 | -0.1 | -0.1 | -0.1 |
| Changes in operating assets and liabilities | 0.3 | -15.6 | 0.0 | 5.9 | -1.4 | 12.5 | 0.0 | -8.3 |
| Net cash used in operating activities | 26.0 | 12.3 | 29.3 | 24.2 | 14.2 | 23.8 | 9.8 | 4.4 |
| |
| Cash flows from investing activities: | | | | | | | | |
| Additions to property, plant and equipment | -4.0 | -3.9 | -3.7 | -2.8 | -2.5 | -3.4 | -3.9 | -5.3 |
| Proceeds from sale of property, plant and equipment | 4.4 | 0.1 | 0.1 | 0.6 | | 0.9 | 0.9 | 0.4 |
| Purchases of investments | -1.2 | -1.1 | -0.1 | -0.1 | -0.1 | -0.1 | -0.1 | -1.1 |
| Net cash provided by (used in) investing activities | -0.8 | -4.9 | -3.7 | -2.3 | -2.2 | -1.6 | -2.1 | -5.0 |
| |
| Cash flows from financing activities: | | | | | | | | |
| Repayments of revolving line of credit and other long-term debt | -0.8 | -0.8 | -0.8 | -0.7 | -0.7 | -36.5 | -39.2 | -39.2 |
| Payment of cash dividends | -6.9 | -6.9 | | -6.8 | -6.7 | -6.6 | -1.8 | -1.8 |
| Treasury stock purchased | | -0.6 | | | -0.3 | -0.2 | | |
| Proceeds from exercise of stock options | | 0.1 | | | 0.1 | 0.4 | 0.6 | 0.5 |
| Net cash used in financing activities | -8.1 | -8.1 | -7.7 | -7.5 | -7.4 | -16.2 | -2.0 | -2.1 |
| Change in cash and cash equivalents | 17.1 | -0.7 | 18.0 | 14.3 | 4.6 | 6.0 | 5.6 | -2.7 |
| Cash and cash equivalents, beginning of period | | 35.2 | | | | 17.2 | | |
| Cash and cash equivalents, end of period | 52.3 | 34.5 | 35.2 | 31.6 | 21.9 | 23.3 | 17.2 | 8.9 |