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Income Taxes - Reconciliation of Unrecognized Tax Benefits, Excluding Interest and Penalties (Detail) (USD $)	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013
Income Tax Disclosure [Abstract]
Balance at February 1	$ 941,000	$ 780,000
Increases in prior period tax positions	31,000	16,000
Increases in current period tax positions	42,000	386,000
Reductions related to lapse of statute of limitations	(299,000)	(241,000)
Balance at January 31	$ 715,000	$ 941,000

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

-URI http://asc.fasb.org/extlink&oid=6527854



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-Name Accounting Standards Codification

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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-Publisher FASB

-Name Accounting Standards Codification

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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