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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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