Business Combination (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 01, 2018	Sep. 02, 2017	Sep. 03, 2016
Business Acquisition [Line Items]
Goodwill	$ 674,998	$ 633,728	$ 624,081
DECO Tool Supply Co. [Member]
Business Acquisition [Line Items]
Acquisition date	Jul. 31, 2017
Purchase price	$ 43,083
Acquired intangible assets	23,200
Goodwill	41,939
Goodwill adjustments	$ 738
All Integrated Solutions ("AIS") [Member]
Business Acquisition [Line Items]
Interest acquired	100.00%
Acquisition date	Apr. 30, 2018
Payments to acquire business	$ 87,848
Non-recurring transaction and integration costs	866
Acquired intangible assets	23,200
Customer relationships	21,000
Finite lived trademark	2,200
Goodwill	41,939
Tax deductible goodwill	4,900
Revenue of acquiree	24,659
Loss of acquiree	4,443
Post-closing working capital adjustment paid out	1,155
Adjustment to tax liability	1,210
Goodwill adjustments	$ 1,210
All Integrated Solutions ("AIS") [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Acquired intangible assets useful life	10 years
All Integrated Solutions ("AIS") [Member] | Trademark [Member]
Business Acquisition [Line Items]
Acquired intangible assets useful life	5 years