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