Accumulated Other Comprehensive Loss (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jan. 02, 2021	Dec. 28, 2019	Jan. 02, 2021	Dec. 28, 2019
Changes in accumulated other comprehensive income (loss) by component
Balance at the beginning of the period	$ 753,800,000	$ 708,100,000	$ 711,400,000	$ 725,800,000
Other comprehensive income before reclassification			62,000,000.0
Amounts reclassified to accumulated other comprehensive loss			1,500,000
Net change in accumulated other comprehensive income	35,100,000	28,800,000	63,500,000	2,100,000
Balance at the end of the period	801,000,000.0	764,300,000	801,000,000.0	764,300,000
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	(137,500,000)	(161,300,000)	(165,900,000)	(134,600,000)
Net change in accumulated other comprehensive income	35,100,000	28,800,000	63,500,000	2,100,000
Balance at the end of the period	(102,400,000)	$ (132,500,000)	(102,400,000)	$ (132,500,000)
Unrealized losses on available-for sale investments
Changes in accumulated other comprehensive income (loss) by component
Balance at the beginning of the period			(5,100,000)
Other comprehensive income before reclassification			0
Amounts reclassified to accumulated other comprehensive loss			0
Net change in accumulated other comprehensive income			0
Balance at the end of the period	(5,100,000)		(5,100,000)
Foreign  currency translation adjustments
Changes in accumulated other comprehensive income (loss) by component
Balance at the beginning of the period			(129,600,000)
Other comprehensive income before reclassification			62,000,000.0
Amounts reclassified to accumulated other comprehensive loss			0
Net change in accumulated other comprehensive income			62,000,000.0
Balance at the end of the period	(67,600,000)		(67,600,000)
Change in unrealized components of defined benefit obligations
Changes in accumulated other comprehensive income (loss) by component
Balance at the beginning of the period			(31,200,000)
Other comprehensive income before reclassification			0
Amounts reclassified to accumulated other comprehensive loss			1,500,000
Net change in accumulated other comprehensive income			1,500,000
Balance at the end of the period	$ (29,700,000)		$ (29,700,000)