Accumulated Other Comprehensive Loss (Details) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 29, 2018	Dec. 30, 2017
Changes in accumulated other comprehensive income (loss) by component
Balance at the beginning of the period			$ 734,900,000
Other comprehensive income (loss) before reclassification			(25,900,000)
Amounts reclassified to accumulated other comprehensive loss			1,400,000
Net change in accumulated other comprehensive (loss) income	$ (12,400,000)	$ 7,100,000	(24,500,000)	$ 17,800,000
Balance at the end of the period	710,100,000		710,100,000
Tax impact of amortization of actuarial gains (losses)			0
Total
Changes in accumulated other comprehensive income (loss) by component
Balance at the beginning of the period			(102,900,000)
Balance at the end of the period	(127,400,000)		(127,400,000)
Unrealized losses on available-for sale investments
Changes in accumulated other comprehensive income (loss) by component
Balance at the beginning of the period			(5,800,000)
Other comprehensive income (loss) before reclassification			200,000
Amounts reclassified to accumulated other comprehensive loss			400,000
Net change in accumulated other comprehensive (loss) income			600,000
Balance at the end of the period	(5,200,000)		(5,200,000)
Foreign currency translation adjustments
Changes in accumulated other comprehensive income (loss) by component
Balance at the beginning of the period			(74,000,000)
Other comprehensive income (loss) before reclassification			(26,100,000)
Amounts reclassified to accumulated other comprehensive loss			0
Net change in accumulated other comprehensive (loss) income			(26,100,000)
Balance at the end of the period	(100,100,000)		(100,100,000)
Change in unrealized components of defined benefit obligations
Changes in accumulated other comprehensive income (loss) by component
Balance at the beginning of the period			(23,100,000)
Other comprehensive income (loss) before reclassification			0
Amounts reclassified to accumulated other comprehensive loss			1,000,000
Net change in accumulated other comprehensive (loss) income			1,000,000
Balance at the end of the period	$ (22,100,000)		$ (22,100,000)