Credit Facility - Additional Information (Detail) (USD $)	6 Months Ended
Apr. 30, 2013	Oct. 31, 2012	Feb. 17, 2012
Debt Instrument [Line Items]
Senior unsecured revolving credit facility entered date	Feb. 17, 2012
Senior unsecured revolving credit facility maximum borrowing capacity			$ 350,000,000
Senior unsecured Term Loan facility, face amount			150,000,000
Senior unsecured term loan facility additional borrowings	150,000,000
Payment schedule for term loan	Principal payments on a portion of the Term Loan are due in equal quarterly installments of $7.5 million, with the remainder due when the Credit Agreement expires in October 2016.
Debt Instrument periodic payment principal	7,500,000
Outstanding borrowing under revolving credit facility	0
Senior unsecured Term Loan facility	120,000,000
Senior unsecured term loan facility long term	$ 90,000,000	$ 105,000,000

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

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- Definition

The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

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- Definition

Increase of additional borrowings on existing and new debt instruments.

+ References

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- Definition

Description of the payment terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment.

+ References

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-Number 129

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- Definition

Amount of the required periodic payments applied to principal.

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- Definition

Amount borrowed under the credit facility as of the balance sheet date.

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- Definition

Date the credit facility first became available, in CCYY-MM-DD format.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB

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-Topic 210

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-Paragraph 1

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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