Operating Lease and Asset Retirement Obligations - Future Minimum Lease Payments Required Under Operating Leases (Detail) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2013
Schedule of Operating Leases [Line Items]
2014	$ 6,295
2015	3,933
2016	2,589
2017	2,001
2018	1,611
Minimum lease payments	$ 16,429

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 16

-Subparagraph b(i)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 122

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

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-Section 55

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-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

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Amount of required minimum rental payments maturing in the fifth rolling twelve months following the latest balance sheet presented for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

No definition available.

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Amount of required minimum rental payments maturing in the forth rolling twelve months following the latest balance sheet presented for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

No definition available.

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Amount of required minimum rental payments maturing in the third rolling twelve months following the latest balance sheet presented for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

No definition available.

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Amount of required minimum rental payments maturing in the second rolling twelve months following the latest balance sheet presented for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

No definition available.

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- Definition

Amount of required minimum rental payments maturing in the next rolling twelve months following the latest balance sheet presented for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

No definition available.

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