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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
	Dec. 08, 2016	Oct. 31, 2016	Oct. 31, 2015
Anti-dilutive securities (in shares)		1,700,000	1,600,000
Cash dividends declared per share		$ 0.8100	$ 0.6225
Dividends Payable, Date to be Paid		Jan. 12, 2017
Payments of Dividends		$ 29,390	$ 22,654
Dividends Payable, Date of Record		Dec. 28, 2016
Scenario, Forecast [Member]
Cash dividends declared per share	$ 0.8100
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

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

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-Name Accounting Standards Codification
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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
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-Subparagraph (SX 210.3-04)
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Date the declared dividend will be paid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6513228

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-Name Regulation S-X (SX)
-Number 210
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