Discontinued Operations - Results of Discontinued Operations (Details) - USD ($)	12 Months Ended
	Dec. 25, 2016	Dec. 27, 2015	Dec. 28, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on disposal of discontinued operations before income taxes		$ 80,800,000
Total gain (loss) of discontinued operations before income taxes	$ (100,000)	75,500,000	$ (1,100,000)
Income tax expense	0	22,500,000	1,200,000
Income (loss) from discontinued operations	(100,000)	53,000,000	(2,300,000)
Herley
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	0	59,700,000	108,900,000
Cost of sales	0	40,600,000	70,100,000
Selling, general and administrative expenses	100,000	15,200,000	24,100,000
Interest expense, net	0	9,100,000	15,100,000
Other net expense items that are not major	0	100,000	700,000
Loss from discontinued operations before income taxes	(100,000)	(5,300,000)	(1,100,000)
Gain on disposal of discontinued operations before income taxes	0	80,800,000	0
Total gain (loss) of discontinued operations before income taxes	(100,000)	75,500,000	(1,100,000)
Income tax expense	0	22,500,000	1,200,000
Income (loss) from discontinued operations	$ (100,000)	$ 53,000,000	$ (2,300,000)