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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May. 25, 2016 | Mar. 02, 2016 | Jan. 28, 2016 | Apr. 30, 2016 | Apr. 30, 2015 | Apr. 30, 2016 | Apr. 30, 2015 | May. 29, 2015
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized to be repurchased |  |  |  |  |  |  |  | 14,000,000.0
Stock repurchased during the period (in shares) |  |  |  | 0 |  | 2,070,000 |  |
Stock repurchased during the period, value |  |  |  |  |  | $ 68.0 |  |
Average price per share (in usd per share) |  |  |  |  |  | $ 32.85 |  |
Shares with remaining authorization for repurchase under stock repurchase plan (in shares) |  |  |  | 10,900,000.0 |  | 10,900,000.0 |  |
Cash dividend declared per common share (in usd per share) |  |  | $ 0.175 |  |  |  |  |
Dividends paid per share (in usd per share) |  | $ 0.170 |  | $ 0.170 | $ 0.165 | $ 0.510 | $ 0.495 |
Subsequent Event |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Cash dividend declared per common share (in usd per share) | $ 0.170 |  |  |  |  |  |  |

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