CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 27, 2015	Dec. 28, 2014	Dec. 29, 2013
Operating activities:
Net income (loss)	$ 19.8	$ (78.0)	$ (37.2)
Income (loss) from discontinued operations	53.0	(2.3)	(7.7)
Loss from continuing operations	(33.2)	(75.7)	(29.5)
Adjustments to reconcile loss from continuing operations to net cash provided by operating activities from continuing operations:
Depreciation and amortization	25.5	32.4	46.4
Deferred income taxes	0.9	1.8	(0.4)
Stock-based compensation	6.1	3.6	7.2
Loss on extinguishment of debt	3.4	39.1	0.0
Non-cash income tax benefit	(18.7)	0.0	0.0
Amortization of deferred financing costs	1.9	3.2	5.1
Amortization of premium and discount on Senior Secured Notes	1.1	(0.9)	(4.2)
Provision for doubtful accounts	0.4	1.5	1.0
Change in accrual for excess facilities	(2.3)	0.2	(4.7)
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	10.3	14.8	12.0
Inventoried costs	(8.2)	2.7	18.3
Prepaid expenses	(3.5)	2.7	2.2
Other assets	(3.2)	1.3	(6.9)
Accounts payable	2.9	(11.6)	(23.2)
Accrued expenses	0.6	(9.8)	(0.5)
Accrued compensation	(4.4)	1.0	(2.3)
Accrued interest	1.5	0.4	(1.1)
Billings in excess of costs and earnings on uncompleted contracts	(7.3)	(0.9)	6.3
Income tax receivable and payable	(3.1)	0.4	1.6
Other liabilities	(0.4)	(3.7)	(5.4)
Net cash provided by (used in) operating activities from continuing operations	(29.7)	2.5	21.9
Investing activities:
Cash paid for acquisitions, net of cash acquired	0.0	(2.6)	2.2
Proceeds from sale of assets	0.9	0.0	0.0
Change in restricted cash	4.7	(0.4)	0.4
Capital expenditures	(11.3)	(11.6)	(13.3)
Net cash used in investing activities from continuing operations	(5.7)	(14.6)	(10.7)
Financing activities:
Proceeds from the issuance of long-term debt, net of issuance costs	0.0	618.5	0.0
Extinguishment of long-term debt	(175.0)	(661.5)	0.0
Borrowing under credit facility	0.0	41.0	0.0
Repayments under credit facility	(42.0)	(1.0)	(1.0)
Cash paid for contingent acquisition consideration	(1.1)	0.0	(2.1)
Debt issuance costs	0.0	(10.0)	0.0
Proceeds from exercise of restricted stock units, employee stock options, and employee stock purchase plan	3.4	3.3	1.5
Other	0.0	0.0	(0.4)
Net cash used in financing activities from continuing operations	(214.7)	(9.7)	(2.0)
Net cash flows of continuing operations	(250.1)	(21.8)	9.2
Net operating cash flows of discontinued operations	2.8	4.1	(1.4)
Net investing cash flows of discontinued operations	242.5	(2.6)	(2.0)
Effect of exchange rate changes on cash and cash equivalents	(0.2)	(0.4)	0.0
Net increase (decrease) in cash and cash equivalents	(5.0)	(20.7)	5.8
Cash and cash equivalents at beginning of year	33.5	54.2	48.4
Cash and cash equivalents at end of year	28.5	33.5	54.2
Supplemental disclosure of cash flow information:
Cash paid during the year for interest	43.8	57.1	63.8
Net cash paid during the year for income taxes	$ 8.8	$ 1.2	$ 0.2