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Mergers and Acquisitions - Contingent Consideration Narrative (Details)
CAD in Millions
 3 Months Ended 12 Months Ended
Jul. 03, 2017
USD ($)
Oct. 01, 2017
USD ($)
Apr. 02, 2017
USD ($)
Oct. 02, 2016
USD ($)
Mar. 27, 2016
USD ($)
Dec. 27, 2015
USD ($)
Sep. 27, 2015
USD ($)
Jun. 28, 2015
USD ($)
Mar. 29, 2015
CAD
Mar. 29, 2015
USD ($)
Sep. 28, 2014
USD ($)
Dec. 29, 2013
CAD
Oct. 01, 2017
USD ($)
Oct. 02, 2016
USD ($)
Sep. 27, 2015
USD ($)
Business acquisition                              
Increase (decrease) in contingent consideration                         $ (6,900,000) $ 2,800,000  
Contingent earn-out liability   $ 2,400,000         $ 0           2,400,000   $ 0
Aggregate maximum of contingent consideration   8,900,000                     8,900,000    
Gain (loss) on change in contingent consideration                         $ 6,900,000 (2,800,000)  
Impairment of goodwill $ 0           58,100,000                
CEG                              
Business acquisition                              
Earn-out period               3 years              
Increase (decrease) in contingent consideration         $ 1,800,000                 1,800,000  
Earn-out paid to former owners   $ 1,300,000   $ 2,300,000                      
Contingent earn-out liability     $ 1,800,000 3,900,000     4,100,000 $ 4,100,000           3,900,000 4,100,000
Aggregate maximum of contingent consideration             9,800,000 9,800,000             9,800,000
Potential earn-out to be paid each year               $ 3,250,000              
Estimated potential earn-out (as a percent)               42.00%              
Minimum operating income threshold to earn contingent consideration during year one               $ 2,000,000              
Minimum operating income threshold to earn contingent consideration during year two               2,300,000              
Minimum operating income threshold to earn contingent consideration during year three               2,600,000              
Gain (loss) on change in contingent consideration     2,100,000   $ (1,800,000)                    
Potential maximum earn-out to be paid               9,800,000              
Operating income to earn maximum consideration during the first year               4,500,000              
Operating income to earn maximum consideration during the second year               4,800,000              
Operating income to earn maximum consideration during the third year               $ 5,100,000              
Impairment of goodwill     0                        
Other Acquisitions                              
Business acquisition                              
Earn-out paid to former owners                           1,000,000  
Contingent earn-out liability             $ 0               0
Gain (loss) on change in contingent consideration                           (1,000,000)  
INDUS                              
Business acquisition                              
Earn-out period         2 years                    
Contingent earn-out liability     0 $ 4,900,000 $ 4,700,000                 $ 4,900,000  
Aggregate maximum of contingent consideration         8,000,000                    
Potential earn-out to be paid each year         $ 4,000,000                    
Estimated potential earn-out (as a percent)         50.00%                 59.00%  
Minimum operating income threshold to earn contingent consideration during year one     3,200,000   $ 3,200,000                    
Minimum operating income threshold to earn contingent consideration during year two     3,600,000   3,600,000                    
Gain (loss) on change in contingent consideration     5,000,000                        
Operating income to earn maximum consideration during the first year         3,600,000                    
Operating income to earn maximum consideration during the second year         $ 4,000,000                    
Impairment of goodwill     $ 0                        
Caber                              
Business acquisition                              
Earn-out period                       2 years      
Increase (decrease) in contingent consideration                     $ 1,000,000       (3,100,000)
Earn-out paid to former owners                 CAD 4.0 $ 3,200,000          
Contingent earn-out liability                   0   CAD 6.5      
Aggregate maximum of contingent consideration | CAD                       8.0      
Potential earn-out to be paid each year | CAD                       CAD 4.0      
Estimated potential earn-out (as a percent)                       81.00%      
Minimum operating income threshold to earn contingent consideration during year one | CAD                       CAD 4.0      
Minimum operating income threshold to earn contingent consideration during year two | CAD                 CAD 4.6     4.6      
Gain (loss) on change in contingent consideration           $ 0       $ 3,100,000 (1,000,000)       $ 3,100,000
Potential maximum earn-out to be paid                     $ 4,000,000        
Operating income to earn maximum consideration during the first year | CAD                       4.4      
Operating income to earn maximum consideration during the second year | CAD                       CAD 5.1      
Minimum                              
Business acquisition                              
Earn-out period                         2 years    
Maximum                              
Business acquisition                              
Earn-out period                         3 years