Accumulated Other Comprehensive Income (Loss) - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Mar. 30, 2024	Dec. 30, 2023	Sep. 30, 2023	Apr. 01, 2023	Dec. 31, 2022	Oct. 01, 2022	Mar. 30, 2024	Apr. 01, 2023
Changes in accumulated other comprehensive income (loss) by component
Balance at the beginning of the period	$ 1,277.8	$ 1,310.8	$ 1,355.8	$ 1,543.6	$ 1,526.4	$ 1,875.0	$ 1,355.8	$ 1,875.0
Other comprehensive gain (loss), net	(0.4)	4.0	1.1	3.7	3.6	(0.6)	4.7	6.7
Balance at the end of the period	1,176.7	1,277.8	1,310.8	1,538.0	1,543.6	1,526.4	1,176.7	1,538.0
Unrealized loss on available-for-sale securities is presented net of tax	(0.1)	1.0	0.4	1.0	1.0	(0.2)
Total
Changes in accumulated other comprehensive income (loss) by component
Balance at the beginning of the period	9.2	5.2	4.1	3.4	(0.2)	0.4	4.1	0.4
Other comprehensive gain (loss), net	(0.4)	4.0	1.1	3.7	3.6	(0.6)
Balance at the end of the period	8.8	9.2	5.2	7.1	3.4	(0.2)	8.8	7.1
Foreign Currency Translation Adjustments, Net Of Tax
Changes in accumulated other comprehensive income (loss) by component
Balance at the beginning of the period	10.4	10.2	10.4	9.7	9.7	9.7	10.4	9.7
Other comprehensive gain (loss), net	(0.1)	0.2	(0.2)	0.3	0.0	0.0
Balance at the end of the period	10.3	10.4	10.2	10.0	9.7	9.7	10.3	10.0
Defined Benefit Obligations, Net Of Tax
Changes in accumulated other comprehensive income (loss) by component
Balance at the beginning of the period	(0.4)	(0.4)	(0.4)	1.0	1.0	1.0	(0.4)	1.0
Other comprehensive gain (loss), net	0.0	0.0	0.0	0.0	0.0	0.0
Balance at the end of the period	(0.4)	(0.4)	(0.4)	1.0	1.0	1.0	(0.4)	1.0
Unrealized Gain (Loss) On Available-for-sale Securities, Net Of Tax
Changes in accumulated other comprehensive income (loss) by component
Balance at the beginning of the period	(0.8)	(4.6)	(5.9)	(7.3)	(10.9)	(10.3)	(5.9)	(10.3)
Other comprehensive gain (loss), net	(0.3)	3.8	1.3	3.4	3.6	(0.6)
Balance at the end of the period	$ (1.1)	$ (0.8)	$ (4.6)	$ (3.9)	$ (7.3)	$ (10.9)	$ (1.1)	$ (3.9)