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Restructuring and Divestiture Charges - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2017
Jul. 01, 2017
Apr. 01, 2017
Dec. 31, 2016
Sep. 24, 2016
Jun. 27, 2015
Sep. 27, 2014
Dec. 28, 2013
Sep. 30, 2017
Sep. 24, 2016
Sep. 26, 2015
Sep. 27, 2014
Restructuring Cost and Reserve [Line Items]                        
Gain on sale of business             $ 5.3   $ 899.7 $ 0.0 $ 0.0  
Restructuring reserve, translation adjustment           $ 9.6            
Cynosure                        
Restructuring Cost and Reserve [Line Items]                        
Severance charges $ 1.3 $ 4.3 $ 1.5                  
Bedford [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Facility closure costs   $ 1.3   $ 3.5                
Fiscal 2014 Actions [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Severance charges               $ 6.3       $ 16.6
Compensation charges                       $ 1.8
Fiscal 2014 Actions [Member] | Jack Cumming [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Severance charges               6.6        
Compensation charges               $ 4.4        
Restructuring Charges [Member] | San Diego [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Severance charges $ 1.4       $ 0.9              
Restructuring Charges [Member] | Bedford [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Severance charges                 1.7      
Restructuring Charges [Member] | International [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Severance charges                   $ 7.9    
Restructuring Charges [Member] | Fiscal 2015 Charges [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Facility closure costs                     2.6  
Workforce reductions                     16.3  
Restructuring Charges [Member] | Fiscal 2015 Actions [Member] | Fiscal 2015 Charges [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Severance charges                 $ 0.0      
Facility closure costs                     0.0  
Workforce reductions                     10.0  
Compensation charges                     4.1  
Restructuring Charges [Member] | Fiscal 2014 Actions [Member] | Fiscal 2015 Charges [Member]                        
Restructuring Cost and Reserve [Line Items]                        
Facility closure costs                     2.0  
Workforce reductions                     $ 6.0  
Number of office locations                     0.0