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Quarterly Summary - Quarterly Summary (Parenthetical) (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended			4 Months Ended	12 Months Ended
	May 06, 2017	Feb. 11, 2017	Nov. 19, 2016	Aug. 26, 2017	Aug. 26, 2017
Selected Quarterly Financial Information [Line Items]
Increase in diluted earnings per share					$ 0.81
ASU 2016-09 [Member]
Selected Quarterly Financial Information [Line Items]
Increase in net income	$ 11.4	$ 12.5	$ 3.1	$ 4.1
Increase in basic earnings per share	$ 0.40	$ 0.43	$ 0.11	$ 0.15
Increase in diluted earnings per share	$ 0.32	$ 0.37	$ 0.03	$ 0.09

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