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Restructuring Charges - Charges Taken Related to Restructuring Actions (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jul. 01, 2017
Apr. 01, 2017
Mar. 31, 2018
Sep. 30, 2017
Bedford [Member]        
Restructuring Cost and Reserve [Line Items]        
Facility closure costs $ 1.3 $ 3.5    
Restructuring | Two Thousand Seventeen [Member]        
Restructuring Cost and Reserve [Line Items]        
Workforce reductions       $ 8.5
Facility closure costs       4.8
Fiscal restructuring charges       13.3
Restructuring | Two thousand eighteen [Member]        
Restructuring Cost and Reserve [Line Items]        
Workforce reductions     $ 5.6  
Fiscal restructuring charges     5.6  
Restructuring | Fiscal 2018 Action [Member] | Two Thousand Seventeen [Member]        
Restructuring Cost and Reserve [Line Items]        
Workforce reductions       0.0
Facility closure costs       0.0
Fiscal restructuring charges       0.0
Restructuring | Fiscal 2018 Action [Member] | Two thousand eighteen [Member]        
Restructuring Cost and Reserve [Line Items]        
Workforce reductions     5.6  
Fiscal restructuring charges     5.6  
Restructuring | Fiscal 2017 Actions [Member] | Two Thousand Seventeen [Member]        
Restructuring Cost and Reserve [Line Items]        
Workforce reductions       8.5
Facility closure costs       0.0
Fiscal restructuring charges       8.5
Restructuring | Fiscal 2017 Actions [Member] | Two thousand eighteen [Member]        
Restructuring Cost and Reserve [Line Items]        
Workforce reductions     0.0  
Fiscal restructuring charges     0.0  
Restructuring | Fiscal 2016 Actions | Two Thousand Seventeen [Member]        
Restructuring Cost and Reserve [Line Items]        
Workforce reductions       0.0
Facility closure costs       4.8
Fiscal restructuring charges       $ 4.8
Restructuring | Fiscal 2016 Actions | Two thousand eighteen [Member]        
Restructuring Cost and Reserve [Line Items]        
Workforce reductions     0.0  
Fiscal restructuring charges     $ 0.0