Acquisitions (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2018	Dec. 29, 2018	Dec. 30, 2017	Jun. 30, 2018
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	$ 57,800	$ 2,949	$ 0
Business Combination, Contingent Consideration, Liability	16,000			$ 8,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	26,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	10,500
Goodwill	$ 41,889	$ 532,251		$ 532,251