Acquisitions Acquisitions (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2016
USD ($)
Feb. 18, 2016
USD ($)
May 31, 2016
USD ($)
May 31, 2015
USD ($)
May 31, 2016
USD ($)
acquisition
May 31, 2015
USD ($)
Mar. 30, 2016
USD ($)
Feb. 17, 2016
USD ($)
Business Acquisition [Line Items]                
Number of Businesses Acquired | acquisition         2      
Business acquisitions         $ 45,121      
Payments to Acquire Businesses, Net of Cash Acquired         80,674 $ 0    
Business Combination, Acquisition Related Costs     $ 1,300 $ 40 2,700 100    
Net sales     305,341 $ 320,100 $ 873,641 $ 948,870    
Larzep                
Business Acquisition [Line Items]                
Business Acquisition, Effective Date of Acquisition   Feb. 17, 2016            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill               $ 4,777
Business acquisitions   $ 9,718            
Payments to Acquire Businesses, Net of Cash Acquired   $ 15,900            
Goodwill, Purchase Accounting Adjustments     2,500          
Net sales     2,000          
FourQuest                
Business Acquisition [Line Items]                
Business Acquisition, Effective Date of Acquisition Mar. 30, 2016              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill             $ 8,700  
Business acquisitions $ 35,400              
Payments to Acquire Businesses, Gross $ 64,300              
Net sales     5,300          
Fiscal 2016 acquisitions [Member]                
Business Acquisition [Line Items]                
Net sales     $ 7,300          
Tradenames | Larzep                
Business Acquisition [Line Items]                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill               1,200
Customer relationships | Larzep                
Business Acquisition [Line Items]                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill               $ 3,600
Customer relationships | FourQuest                
Business Acquisition [Line Items]                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill             8,000  
Other intangibles | FourQuest                
Business Acquisition [Line Items]                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill             $ 700