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Acquisitions - Purchase price allocation (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Aug. 23, 2017
Apr. 01, 2017
Sep. 26, 2016
Aug. 01, 2016
Oct. 31, 2017
Jul. 31, 2017
Acquisitions            
Goodwill         $ 351,818 $ 311,445
BHT Group            
Acquisitions            
Cash paid (net of cash acquired)         60,345  
Debt acquired         0  
Total $ 60,345       60,345  
Property and equipment         835  
Goodwill         41,509  
Deferred income taxes         (5,881)  
Other working capital         5,182  
Total         60,345  
CR Kennedy            
Acquisitions            
Cash paid (net of cash acquired)           11,999
Debt acquired           0
Total   $ 11,999       11,999
Property and equipment           0
Goodwill           5,894
Deferred income taxes           0
Other working capital           1,905
Total           11,999
Vantage            
Acquisitions            
Cash paid (net of cash acquired)           4,044
Debt acquired           0
Total     $ 4,044     4,044
Property and equipment           433
Goodwill           2,299
Deferred income taxes           0
Other working capital           320
Total           4,044
Accutron            
Acquisitions            
Cash paid (net of cash acquired)           53,049
Debt acquired           0
Total       $ 53,049   53,049
Property and equipment           1,676
Goodwill           21,989
Deferred income taxes           112
Other working capital           4,472
Total           53,049
Customer relationships | BHT Group            
Acquisitions            
Amortizable intangible assets:         12,500  
Customer relationships | CR Kennedy            
Acquisitions            
Amortizable intangible assets:           4,200
Customer relationships | Vantage            
Acquisitions            
Amortizable intangible assets:           992
Customer relationships | Accutron            
Acquisitions            
Amortizable intangible assets:           12,800
Technology | BHT Group            
Acquisitions            
Amortizable intangible assets:         6,200  
Technology | CR Kennedy            
Acquisitions            
Amortizable intangible assets:           0
Technology | Vantage            
Acquisitions            
Amortizable intangible assets:           0
Technology | Accutron            
Acquisitions            
Amortizable intangible assets:           10,000
Brand names | BHT Group            
Acquisitions            
Amortizable intangible assets:         $ 0  
Brand names | CR Kennedy            
Acquisitions            
Amortizable intangible assets:           0
Brand names | Vantage            
Acquisitions            
Amortizable intangible assets:           0
Brand names | Accutron            
Acquisitions            
Amortizable intangible assets:           $ 2,000