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Discontinued Operations - Financial Data (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 01, 2017	Dec. 27, 2015	Jan. 01, 2017	Dec. 27, 2015
Financial data
Income from discontinued operations, net of tax	$ (490)	$ 305	$ 3,697	$ 478
TeknaSeal \| Discontinued Operations, Disposed of by Sale
Financial data
Sales			1,277
Cost of sales			(943)
Gross profit			334
Selling, general and administrative			(242)
Income of discontinued operations, before income taxes			92
Gain on sale of discontinued operations	(255)		5,388
Total income from discontinued operations, before income taxes	(255)		5,480
Income tax expense on discontinued operations	(235)		(1,783)
Income from discontinued operations, net of tax	$ (490)		3,697
TeknaSeal \| Discontinued Operations, Held-for-sale
Financial data
Sales		1,191		2,049
Cost of sales		(688)		(1,166)
Gross profit		503		883
Selling, general and administrative		(198)		(405)
Income of discontinued operations, before income taxes		305		478
Total income from discontinued operations, before income taxes		305		478
Income from discontinued operations, net of tax		$ 305		$ 478
Precision Components Group \| TeknaSeal \| Discontinued Operations, Disposed of by Sale
Financial data
Gain on sale of discontinued operations			$ 5,388