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Purchased Intangible Assets - Additional Information (Detail) (USD $) | 12 Months Ended
--- | ---
Jan. 31, 2014 | Jan. 31, 2013 | Jan. 31, 2012
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Goodwill | $ 18,476,000 | $ 18,476,000 |
Goodwill allocated to GPS for income tax reporting purposes | 12,300,000 |  |
Period of amortization of goodwill for income tax purpose | 15 years |  |
Trade name- GPS, Estimated useful life | 15 years |  |
Non- compete GPS, Estimated useful life | 5 years |  |
Trade name- SMC, Estimated useful life | Indefinite |  |
Amounts of accumulated amortization associated with the trade name of GPS | 1,736,000 | 1,493,000 |
Amortization expense | 243,000 | 243,000 | 334,000
Noncompete Agreements [Member] |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Amortization expense |  |  | $ 91,000

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