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Restructuring Charges - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 30, 2019
Dec. 29, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 30, 2017
Jul. 01, 2017
Dec. 31, 2016
Mar. 30, 2019
Sep. 29, 2018
Restructuring Cost and Reserve [Line Items]                  
Severance charges $ 1.3 $ 1.0 $ 2.3 $ 1.8 $ 3.8        
Estimated severance and benefits future costs $ 0.9                
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost         $ 1.3        
Machester UK [Member]                  
Restructuring Cost and Reserve [Line Items]                  
Severance charges               $ 0.8 $ 2.2
Hicksville [Member]                  
Restructuring Cost and Reserve [Line Items]                  
Severance charges   0.3             0.5
Lyberty Way [Member]                  
Restructuring Cost and Reserve [Line Items]                  
Facility closure costs   0.2             $ 0.9
Lease termination cash payment   $ 0.6              
Bedford [Member]                  
Restructuring Cost and Reserve [Line Items]                  
Facility closure costs     $ 1.6     $ 1.3 $ 3.5