Discontinued Operations - Summary of Assets and Liabilities of Discontinued Operations (Details) - USD ($) $ in Millions	Dec. 27, 2015	Dec. 28, 2014
Discontinued Operations and Disposal Groups [Abstract]
Cash and cash equivalents	$ 0.0	$ 1.2
Accounts receivable, net	0.0	30.7
Inventoried costs	0.0	20.6
Other current assets	0.0	1.3
Current assets of discontinued operations	0.0	53.8
Property, plant and equipment, net	0.0	21.0
Goodwill	0.0	113.0
Intangible assets, net	0.0	2.8
Other assets	0.0	0.2
Non-current assets of discontinued operations	0.0	137.0
Accounts payable	0.0	3.8
Accrued expenses	0.0	1.8
Accrued compensation	0.9	5.3
Billings in excess of cost and earnings on uncompleted contracts	0.0	2.5
Other current liabilities	1.0	1.2
Current liabilities of discontinued operations	1.9	14.6
Other long-term liabilities of discontinued operations	$ 4.1	$ 0.5