Acquisitions (Details) - USD ($) $ in Thousands			9 Months Ended
	Jun. 01, 2015	May. 30, 2014	Jul. 31, 2015	Aug. 01, 2014
Payments to Acquire Businesses, Gross			$ 114,353	$ 47,058
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	$ 7,100
Mining Technologies, Inc.
Payments to Acquire Businesses, Gross		$ 44,400
Goodwill acquired		300
Intangible assets acquired		$ 9,900
Montabert S.A.S.
Payments to Acquire Businesses, Gross	121,500
Goodwill acquired	55,700
Intangible assets acquired	$ 35,100