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Restructuring Charges - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Mar. 27, 2021
Jun. 27, 2020
Jun. 29, 2019
Dec. 29, 2018
Jun. 30, 2018
Sep. 25, 2021
Sep. 26, 2020
Sep. 28, 2019
Restructuring Cost and Reserve [Line Items]                
Severance charges           $ 13,400,000 $ 4,000,000  
Incremental cost           5,000,000    
Divestiture charges $ 1,900,000              
Tepnel [Member]                
Restructuring Cost and Reserve [Line Items]                
Divestiture charges 1,300,000              
Cynosure                
Restructuring Cost and Reserve [Line Items]                
Incremental cost 2,600,000              
Divestiture charges $ 2,000,000              
Bedford                
Restructuring Cost and Reserve [Line Items]                
Facility closure costs   $ 1,400,000 $ 1,600,000 $ 3,500,000 $ 1,300,000      
Remaining lease balance           $ 3,800,000    
Fiscal 2019 restructuring charges | Fiscal 2018 Actions                
Restructuring Cost and Reserve [Line Items]                
Severance charges             $ 1,000,000  
Restructuring Charges | Fiscal 2019 restructuring charges                
Restructuring Cost and Reserve [Line Items]                
Facility closure costs               $ 1,200,000
Workforce reductions               $ 5,400,000