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Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions | Total | Amount | Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Loss Items | Treasury Stock, at cost
--- | --- | --- | --- | --- | --- | ---
Beginning balance at Aug. 31, 2016 | $ 1,659.8 | $ 0.5 | $ 856.4 | $ 1,360.9 | $ (139.4) | $ (418.6)
Beginning balance (in shares) at Aug. 31, 2016 |  | 43.7 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 321.7 |  |  | 321.7 |  |
Other comprehensive income (loss) | 39.7 |  |  |  | 39.7 |
Amortization, issuance, and cancellations of restricted stock grants (in shares) |  | 0.1 |  |  |  |
Amortization, issuance, and cancellations of restricted stock grants | 16.8 |  | 16.4 |  |  | 0.4
Employee stock purchase plan issuances | 0.9 |  | 0.9 |  |  |
Cash dividends paid on common stock | (22.7) |  |  | (22.7) |  |
Stock options exercised | 2.1 |  | 2.1 |  |  |
Repurchases of common stock (in shares) |  | (2.0) |  |  |  |
Repurchases of common stock | (357.9) |  |  |  |  | (357.9)
Excess tax benefits from share-based payments | 5.2 |  | 5.2 |  |  |
Ending balance at Aug. 31, 2017 | 1,665.6 | $ 0.5 | 881.0 | 1,659.9 | (99.7) | (776.1)
Ending balance (in shares) at Aug. 31, 2017 |  | 41.8 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 349.6 |  |  | 349.6 |  |
Other comprehensive income (loss) | (4.0) |  |  |  | (4.0) |
Reclassification of stranded tax effects of the Tax Cuts and Jobs Act | 0.0 |  |  | 11.1 | (11.1) |
Amortization, issuance, and cancellations of restricted stock grants (in shares) |  | 0.2 |  |  |  |
Amortization, issuance, and cancellations of restricted stock grants | 23.7 |  | 23.6 |  |  | 0.1
Employee stock purchase plan issuances | 0.6 |  | 0.6 |  |  |
Cash dividends paid on common stock | (21.4) |  |  | (21.4) |  |
Stock options exercised | 1.1 |  | 1.1 |  |  |
Repurchases of common stock (in shares) |  | (2.0) |  |  |  |
Repurchases of common stock | (298.4) |  |  |  |  | (298.4)
Ending balance at Aug. 31, 2018 | 1,716.8 | $ 0.5 | 906.3 | 1,999.2 | (114.8) | (1,074.4)
Ending balance (in shares) at Aug. 31, 2018 |  | 40.0 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 330.4 |  |  | 330.4 |  |
Other comprehensive income (loss) | (36.6) |  |  |  | (36.6) |
Amortization, issuance, and cancellations of restricted stock grants (in shares) |  | 0.2 |  |  |  |
Amortization, issuance, and cancellations of restricted stock grants | 23.1 |  | 23.1 |  |  |
Employee stock purchase plan issuances | 0.6 |  | 0.6 |  |  |
Cash dividends paid on common stock | (20.8) |  |  | (20.8) |  |
Repurchases of common stock (in shares) |  | (0.7) |  |  |  |
Repurchases of common stock | (81.6) |  |  |  |  | (81.6)
Ending balance at Aug. 31, 2019 | $ 1,918.9 | $ 0.5 | $ 930.0 | $ 2,295.8 | $ (151.4) | $ (1,156.0)
Ending balance (in shares) at Aug. 31, 2019 |  | 39.5 |  |  |  |

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