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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Jun. 29, 2019
Jun. 30, 2018
Income Tax Disclosure [Line Items]          
U.S. federal corporate tax rate 21.00%   35.00%   28.17%
Provisional tax expense         $ 41.4
One-time transition tax expense         44.1
Benefit from remeasurement of deferred tax at new tax rate         2.7
Increase in income tax iability, net of foreign tax and research credits $ 11.6        
Provision/(benefit) for income taxes (0.3) $ 3.2      
Gross unrecognized tax benefits 23.8       24.8
Gross unrecognized tax benefits increased (decreased) during the year (1.0)        
Interest and penalties accrued related to unrecognized tax benefits 2.0        
Increase in interest and penalties accrued related to unrecognized tax benefits         $ 0.1
Maximum [Member]          
Income Tax Disclosure [Line Items]          
Estimated increase in unrecognized tax benefit in next twelve months 4.3        
Undistributed Foreign Earnings [Member]          
Income Tax Disclosure [Line Items]          
Provision/(benefit) for income taxes $ 0.0        
Cash Assets [Member]          
Income Tax Disclosure [Line Items]          
One-time transition tax rate on post-1986 foreign earnings and profits 15.50%        
Other Specified Assets [Member]          
Income Tax Disclosure [Line Items]          
One-time transition tax rate on post-1986 foreign earnings and profits 8.00%        
Scenario, Plan [Member]          
Income Tax Disclosure [Line Items]          
U.S. federal corporate tax rate       21.00%