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Net Income Per Common Share Net Loss per Common Share (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended		0 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2015	Jan. 31, 2014	Apr. 15, 2015	Mar. 31, 2015	Mar. 11, 2015
Anti-dilutive securities (in shares)	8,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	14,800us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	4,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1,017,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Cash dividends declared per share	$ 0.4150us-gaap_CommonStockDividendsPerShareDeclared	$ 0.2075us-gaap_CommonStockDividendsPerShareDeclared	$ 0.8300us-gaap_CommonStockDividendsPerShareDeclared	$ 0.4150us-gaap_CommonStockDividendsPerShareDeclared
Payments of Dividends	$ 15,061us-gaap_PaymentsOfDividends	$ 7,500us-gaap_PaymentsOfDividends	$ 30,141us-gaap_PaymentsOfDividends	$ 14,986us-gaap_PaymentsOfDividends
Scenario, Forecast [Member]
Cash dividends declared per share							$ 0.6225us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember
Dividends Payable, Date to be Paid					Apr. 15, 2015
Dividends Payable, Date of Record						Mar. 31, 2015

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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

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Antidilution

-URI http://asc.fasb.org/extlink&oid=6505113



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Diluted Earnings Per Share

-URI http://asc.fasb.org/extlink&oid=6510752



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Contingent Stock Agreement

-URI http://asc.fasb.org/extlink&oid=6508534

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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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: 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)

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- Definition

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

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

+ References

No definition available.

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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

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