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Other Events - Additional Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	0 Months Ended	6 Months Ended
	Dec. 08, 2014	Apr. 30, 2015	Apr. 30, 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 record date		Nov. 17, 2014
Loss contingency, period of occurrence		In January 2015, various class action lawsuits, which have been consolidated into a single lawsuit during our second fiscal quarter, were initiated against the company related to the restatement of previously-issued Financial Statements.

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Aggregate dividends paid during the period for each share of common stock outstanding.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



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-Name Accounting Standards Codification

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-Section S99

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

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States when the existing condition, situation, or set of circumstances involving uncertainty occurred.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

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

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-Glossary Financing Activities

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