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Other Events - Additional Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	0 Months Ended	3 Months Ended
	Dec. 08, 2014	Jan. 31, 2015	Jan. 31, 2014
Other Events [Abstract]
Dividend payment	$ 0.75us-gaap_CommonStockDividendsPerShareCashPaid
Dividend aggregate amount to shareholders	$ 13,000us-gaap_PaymentsOfDividendsCommonStock	$ 12,970us-gaap_PaymentsOfDividendsCommonStock	$ 11,005us-gaap_PaymentsOfDividendsCommonStock
Dividend paid date	Nov. 17, 2014

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- Definition

Dividend Paid Date Day Month And Year

+ References

No definition available.

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X

- Definition

Aggregate dividends paid 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)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

+ 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



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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