Auction Rate Securities - Additional Information (Detail)	9 Months Ended	12 Months Ended
Jul. 31, 2015 USD ($)	Oct. 31, 2014 USD ($)
Schedule of Available-for-sale Securities
Number Of Financial Institution	3	3
Interest Rate Reset Interval	30 days
Auction Rate Securities
Schedule of Available-for-sale Securities
Investments in auction rate securities	$ 15,000,000	$ 15,000,000
Amortized cost basis	13,000,000	13,000,000
Fair value of auction rate securities	13,000,000	13,000,000
Unrealized holding gain (loss) on securities	0	0
Auction Rate Securities \| Retained Earnings
Schedule of Available-for-sale Securities
Total amount of other-than-temporary impairment (OTTI) credit loss recognized	$ 2,000,000	$ 2,000,000

The period of time in which the interest rates for auction rate securities reset through auctions.

No definition available.

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- Definition

The number of different issuers of the auction rate securities held by the Company.

+ References

No definition available.

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- Definition

This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

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-Publisher FASB

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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- Definition

Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income.

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- Definition

Amount before tax and reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities.

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- Definition

The cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity).

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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