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