Acquisitions - Schedule of Preliminary Valuation and Amortization Period of Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Aug. 31, 2017	May 31, 2017
Business Acquisition [Line Items]
Intangible assets acquired	$ 455
G&K Services
Business Acquisition [Line Items]
Intangible assets acquired	$ 536,000
Service contracts | G&K Services
Business Acquisition [Line Items]
Intangible assets acquired		$ 519,000
Amortization period (in years)		15 years
Trade names | G&K Services
Business Acquisition [Line Items]
Intangible assets acquired		$ 17,000
Amortization period (in years)		3 years