Recent Accounting Pronouncements - Narrative (Details) $ in Millions	3 Months Ended
	Nov. 25, 2017 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Discrete tax benefits related to adoption new policy	$ 1.6
Accounting Standards Update 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stock based compensation, increase	0.1
Retained Earnings | Accounting Standards Update 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment, increase (decrease)	(0.7)
Additional Paid-in Capital | Accounting Standards Update 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment, increase (decrease)	$ 0.7