Long-Term Debt and Notes Payable - Long-Term Debt and Notes Payable (Detail) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013
Debt Instrument [Line Items]
Long-term debt gross	$ 22,200	$ 4,383
Less current portion	(75)	(145)
Long-term debt	22,125	4,238
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt gross	22,000	4,000
Other Equipment Notes [Member]
Debt Instrument [Line Items]
Long-term debt gross	$ 200	$ 383