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Acquisitions - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Aug. 15, 2016
Aug. 01, 2015
May 31, 2016
Business Acquisition [Line Items]      
Goodwill expected to be deductible for income tax purposes   $ 0  
ZEE      
Business Acquisition [Line Items]      
Consideration transferred   134,000  
Cash consideration   120,600  
Contingent consideration subject to holdback provisions   $ 13,400  
ZEE | Level 3      
Business Acquisition [Line Items]      
Discount rate     11.00%
ZEE | Service contracts      
Business Acquisition [Line Items]      
Estimated useful life of service contracts     10 years
G&K Services      
Business Acquisition [Line Items]      
Share price of acquisition (in dollars per share) $ 97.50    
Consideration transferred $ 2,200,000