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Income Taxes - Components of Company's Income Tax Expense Related to Continuing Operations (Detail) (USD $) | 12 Months Ended
--- | ---
Jan. 31, 2014 | Jan. 31, 2013 | Jan. 31, 2012
Current: |  |  |
Federal | $ 20,765,000 | $ 11,555,000 | $ 3,771,000
State | 3,525,000 | 2,224,000 | 836,000
Total | 24,290,000 | 13,779,000 | 4,607,000
Deferred: |  |  |
Federal | 1,419,000 | (207,000) | 41,000
State | 282,000 | 68,000 | (92,000)
Total | 1,701,000 | (139,000) | (51,000)
Income tax expense | $ 25,991,000 | $ 13,640,000 | $ 4,556,000

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