Indebtedness - Debt Outstanding Maturities (Detail) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2013
Long Term Debt Maturities Repayments Of Principal [Line Items]
2014	$ 12,789
2015	984
2016	555
2017	95,000
2018
Notes Payable [Member]
Long Term Debt Maturities Repayments Of Principal [Line Items]
2014	11,586
2015	71
2016	19
2018
Credit Agreement [Member]
Long Term Debt Maturities Repayments Of Principal [Line Items]
2017	95,000
2018
Capitalized Lease Obligations [Member]
Long Term Debt Maturities Repayments Of Principal [Line Items]
2014	1,203
2015	913
2016	536
2018

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 47

-Paragraph 10

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year.

+ References

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- Definition

Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year.

+ References

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year.

+ References

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year.

+ References

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