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Business Combination - Summary of Results of Operation as Reported and Proforma Basis (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Sep. 28, 2019
Sep. 29, 2018
Business Combination Recognized Identifiable Assets Acquired Goodwill And Liabilities Assumed Net [Abstract]        
Net sale, Reported $ 354,458 $ 355,436 $ 726,346 $ 677,697
Net loss, Reported       $ (77,878)
Net sale, Proforma   723,501    
Net loss, Proforma   $ (62,769)