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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2020
Dec. 26, 2020
Dec. 31, 2019
Dec. 28, 2019
Dec. 31, 2020
Dec. 26, 2020
Dec. 31, 2019
Dec. 28, 2019
Income Tax Disclosure [Line Items]                
Benefit for income taxes $ 2.4 $ 2.4 $ 12.0 $ 12.0 $ 6.0 $ 6.0 $ 7.1 $ 7.1
Gross unrecognized tax benefits   22.1       22.1    
Interest and penalties accrued related to unrecognized tax benefits   1.7       1.7    
Increase (decrease) in interest and penalties accrued related to unrecognized tax benefits           (0.3)    
Maximum [Member]                
Income Tax Disclosure [Line Items]                
Estimated increase in unrecognized tax benefit in next twelve months   $ 3.2       $ 3.2