| In millions, except per share items | Jun-30-22 | Jun-30-21 | Jun-30-20 | Jun-30-19 | Jun-30-18 | Jun-30-17 | Jun-30-16 | Jun-30-15 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K/A | 10-K |
| Operating activities: | | | | | | | | |
| Net loss | -63.9 | -31.2 | -33.1 | 28.0 | -11.5 | 0.1 | 25.5 | -1.9 |
| Adjustments to reconcile net loss to net cash provided (used) by operating activities: | | | | | | | | |
| Depreciation and amortization | 15.3 | 17.9 | 19.1 | 18.2 | 20.3 | 21.6 | 21.4 | 23.5 |
| Goodwill impairment | 18.3 | | 38.5 | | 18.0 | | | |
| Stock-based compensation expense | 7.9 | 8.2 | 9.9 | 11.9 | 8.6 | 7.5 | 6.3 | 6.3 |
| Operating lease impairment due to restructuring | | | | | | | | |
| Deferred income tax | 5.4 | 0.9 | -3.6 | 2.1 | -1.2 | -2.6 | 1.9 | -1.1 |
| Gain on sale of property, plant and equipment | -33.1 | -1.2 | -0.8 | -0.9 | -0.7 | -0.1 | 0.0 | -0.3 |
| Provision for uncollectible accounts | 0.7 | 0.1 | 1.2 | 0.0 | 0.1 | 1.7 | 6.0 | 0.4 |
| Other | 0.2 | 0.5 | 0.0 | 0.7 | 0.4 | 0.3 | 0.2 | 0.2 |
| Changes in operating assets and liabilities increasing (decreasing) cash: | | | | | | | | |
| Accounts receivable | -6.6 | 11.1 | 56.6 | -15.4 | 5.5 | -11.9 | 4.2 | 6.8 |
| Costs and estimated earnings in excess of billings on uncompleted contracts | -14.0 | 28.8 | 36.5 | -19.8 | 14.5 | 13.6 | -17.9 | -13.1 |
| Inventories | -2.6 | -0.9 | 1.6 | -2.9 | -1.4 | 0.2 | 0.6 | 0.3 |
| Other assets and liabilities | -0.5 | -21.9 | 11.0 | -12.2 | 0.4 | -7.6 | 7.4 | 11.6 |
| Accounts payable | 13.7 | -12.4 | -38.9 | 32.7 | -25.9 | -37.0 | 14.7 | 13.0 |
| Billings on uncompleted contracts in excess of costs and estimated earnings | 11.3 | -8.6 | -41.7 | -15.0 | 45.6 | | | |
| Accrued expenses | -7.6 | 5.5 | -17.4 | 14.4 | 1.8 | -9.6 | 1.7 | -7.8 |
| Net cash provided (used) by operating activities | -54.2 | -3.0 | 44.1 | 41.4 | 74.7 | -18.7 | 33.6 | 26.2 |
| |
| Investing activities: | | | | | | | | |
| Capital expenditures | -3.3 | -4.4 | -18.5 | -19.6 | -8.7 | -11.9 | -13.9 | -15.8 |
| Proceeds from asset sales | 39.0 | 2.1 | 1.4 | 1.2 | 1.1 | 1.3 | 0.4 | 0.8 |
| Net cash used by investing activities | 35.7 | -2.3 | -17.1 | -14.4 | -9.3 | -51.4 | -26.6 | -20.6 |
| |
| Financing activities: | | | | | | | | |
| Advances under asset-backed credit facility | 20.0 | | | 16.2 | 85.3 | 126.9 | 10.2 | 11.2 |
| Repayments of advances under senior secured revolving credit facility | -5.0 | | | -10.9 | -130.2 | -82.3 | -19.0 | -14.0 |
| Payment of debt amendment fees | -1.3 | -1.3 | | | -0.4 | -1.1 | | |
| Issuances of common stock | 0.5 | 0.3 | 0.3 | 0.4 | 0.3 | 0.6 | 0.6 | 0.5 |
| Proceeds from issuance of common stock under employee stock purchase plan | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 |
| Repurchase of common stock for payment of statutory taxes due on equity-based compensation | -0.9 | -1.6 | -3.5 | -1.7 | -0.6 | -2.3 | -4.6 | -2.5 |
| Net cash used by financing activities | 12.7 | -12.3 | -16.0 | -1.1 | -45.3 | 42.7 | -13.8 | -1.0 |
| |
| Supplemental disclosure of cash flow information: | | | | | | | | |
| Income taxes | -2.9 | 0.5 | 6.4 | 3.3 | 1.4 | 12.0 | 9.4 | 7.0 |
| Interest, including payment of debt amendment fees | 2.8 | 1.8 | 2.1 | 1.7 | 2.7 | 1.8 | 0.9 | 1.3 |
| Non-cash investing and financing activities: | | | | | | | | |
| Purchases of property, plant and equipment on account | 0.1 | 0.1 | 0.0 | 2.7 | 0.2 | 0.5 | 0.2 | 0.4 |