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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Jun. 29, 2019
Changes in accumulated other comprehensive income (loss) by component      
Balance at the beginning of the period $ 1,497.1 $ 926.1 $ 926.1
Other comprehensive income 0.1 0.5  
Balance at the end of the period 1,561.3 983.5 1,497.1
Unrealized gain on available-for-sale securities, tax     0.2
Foreign currency translation adjustments, net of tax      
Changes in accumulated other comprehensive income (loss) by component      
Balance at the beginning of the period 9.7 10.3 10.3
Other comprehensive income 0.0 0.1  
Balance at the end of the period 9.7 10.4 9.7
Defined benefit obligations, net of tax      
Changes in accumulated other comprehensive income (loss) by component      
Balance at the beginning of the period (3.5) (2.3) (2.3)
Other comprehensive income 0.0 0.0  
Balance at the end of the period (3.5) (2.3) (3.5)
Unrealized gain (loss) on available-for-sale securities, net of tax (3)      
Changes in accumulated other comprehensive income (loss) by component      
Balance at the beginning of the period 0.9 (1.6) (1.6)
Other comprehensive income 0.1 0.4  
Balance at the end of the period 1.0 (1.2) 0.9
Total      
Changes in accumulated other comprehensive income (loss) by component      
Balance at the beginning of the period 7.1 6.4 6.4
Other comprehensive income 0.1 0.5  
Balance at the end of the period $ 7.2 $ 6.9 $ 7.1