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Other Expense - Additional Information (Detail)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 29, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 29, 2018
USD ($)
Offering
Sep. 30, 2017
USD ($)
Other Income And Expenses [Line Items]        
Legal, accounting and advisory services $ 0.5 $ 0.8 $ 6.9 $ 0.8
Number of public offerings | Offering     2  
Expenses related to prior acquisition and disposition of former business unit       $ 0.1
Public Offerings [Member]        
Other Income And Expenses [Line Items]        
Legal, accounting and advisory services $ 0.8   $ 0.8