Accumulated Other Comprehensive Loss (Details) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 28, 2024	Dec. 30, 2023
Changes in accumulated other comprehensive income (loss) by component
Balance at the beginning of the period	$ 702,100,000	$ 675,200,000	$ 681,600,000	$ 690,800,000
Other comprehensive loss before reclassification			(11,000,000.0)
Amounts reclassified out of accumulated other comprehensive loss			200,000
Net change in accumulated other comprehensive loss	(41,200,000)	29,700,000	(10,800,000)	9,200,000
Balance at the end of the period	682,800,000	728,000,000.0	682,800,000	728,000,000.0
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	(113,600,000)	(156,500,000)	(144,000,000.0)	(136,000,000.0)
Net change in accumulated other comprehensive loss	(41,200,000)	29,700,000	(10,800,000)	9,200,000
Balance at the end of the period	(154,800,000)	$ (126,800,000)	(154,800,000)	$ (126,800,000)
Unrealized losses on available-for sale investments
Changes in accumulated other comprehensive income (loss) by component
Balance at the beginning of the period			(5,300,000)
Other comprehensive loss before reclassification			0
Amounts reclassified out of accumulated other comprehensive loss			0
Net change in accumulated other comprehensive loss			0
Balance at the end of the period	(5,300,000)		(5,300,000)
Foreign  currency translation adjustments
Changes in accumulated other comprehensive income (loss) by component
Balance at the beginning of the period			(131,400,000)
Other comprehensive loss before reclassification			(11,000,000.0)
Amounts reclassified out of accumulated other comprehensive loss			0
Net change in accumulated other comprehensive loss			(11,000,000.0)
Balance at the end of the period	(142,400,000)		(142,400,000)
Change in unrealized components of defined benefit obligations
Changes in accumulated other comprehensive income (loss) by component
Balance at the beginning of the period			(7,300,000)
Other comprehensive loss before reclassification			0
Amounts reclassified out of accumulated other comprehensive loss			200,000
Net change in accumulated other comprehensive loss			200,000
Balance at the end of the period	$ (7,100,000)		$ (7,100,000)