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Net Income Per Common Share Net Income per Common Share (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 07, 2017 | Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2017 | Apr. 30, 2016
Anti-dilutive securities (in shares) |  | 12,000 | 24,000 | 4,000 | 13,000
Cash dividends declared per share |  | $ 1.053 | $ 0.81 | $ 2.673 | $ 2.055
Payments of Dividends |  | $ 42,300 | $ 29,300 | $ 104,035 | $ 74,530
Dividends Payable, Date to be Paid |  | Jul. 13, 2017 |  |  |
Dividends Payable, Date of Record |  | Jun. 28, 2017 |  |  |
Scenario, Forecast [Member] |  |  |  |  |
Cash dividends declared per share | $ 1.053 |  |  |  |
Common Stock [Member] |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 3,327,719 |
Exchangeable Shares [Member] |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 418,095 |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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