EARNINGS PER SHARE (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014
Earnings Per Share [Abstract]
Net income	$ 71,246us-gaap_NetIncomeLoss	$ 50,988us-gaap_NetIncomeLoss	$ 137,749us-gaap_NetIncomeLoss	$ 79,859us-gaap_NetIncomeLoss
Distributed and undistributed (earnings) to unvested restricted stock	(1,388)	(1,390)	(3,124)	(2,198)
Distributed and undistributed earnings to common shareholders—Basic	$ 69,858	$ 49,598	$ 134,625	$ 77,661
Weighted average shares outstanding—Basic	22,318	22,441	22,438	22,432
Weighted average shares outstanding—Diluted	22,318	22,441	22,438	22,432
Earnings per common share-Basic (in usd per share)	$ 3.13us-gaap_EarningsPerShareBasic	$ 2.21us-gaap_EarningsPerShareBasic	$ 6.00us-gaap_EarningsPerShareBasic	$ 3.46us-gaap_EarningsPerShareBasic
Earnings per common share-Diluted (in usd per share)	$ 3.13us-gaap_EarningsPerShareDiluted	$ 2.21us-gaap_EarningsPerShareDiluted	$ 6.00us-gaap_EarningsPerShareDiluted	$ 3.46us-gaap_EarningsPerShareDiluted

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Amount of earnings (loss) distributed and earnings (loss) allocated to participating securities for the diluted earnings (loss) per share or per unit calculation under the two-class method.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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