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Income Taxes (Tables) | 12 Months Ended
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Jan. 31, 2014
Income Tax Disclosure [Abstract] |
Company's Income Tax Expense Related to Continuing Operations | The components of the Company’s income tax expense related to continuing operations for the years ended January 31, 2014, 2013 and 2012 are presented below:
|  | 2014 |  |  | 2013 |  |  | 2012 |
Current: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 20,765,000 |  |  | $ | 11,555,000 |  |  | $ | 3,771,000 |
State |  |  | 3,525,000 |  |  |  | 2,224,000 |  |  |  | 836,000 |
|  |  | 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 | )
|  |  | 1,701,000 |  |  |  | (139,000 | ) |  |  | (51,000 | )
Income tax expense |  | $ | 25,991,000 |  |  | $ | 13,640,000 |  |  | $ | 4,556,000 |
Actual Income Tax Expense Amounts | The actual income tax expense amounts for the years ended January 31, 2014, 2013 and 2012 differed from the expected tax amounts computed by applying the U.S. federal corporate income tax rate of 35% for the year ended January 31, 2014 and 2013, and 34% for the year ended January 31, 2012, to income from continuing operations before income taxes as presented below:
|  | 2014 |  |  | 2013 |  |  | 2012 |
Computed “expected” income tax |  | $ | 24,267,000 |  |  | $ | 12,510,000 |  |  | $ | 4,068,000 |
Increase (decrease) resulting from: |  |  |  |  |  |  |  |  |  |  |  |
State income taxes, net |  |  | 2,574,000 |  |  |  | 1,459,000 |  |  |  | 460,000 |
Permanent differences |  |  | (1,105,000 | ) |  |  | (730,000 | ) |  |  | (138,000 | )
Federal income tax true-up and other adjustments |  |  | 255,000 |  |  |  | 401,000 |  |  |  | 166,000 |
Income tax expense |  | $ | 25,991,000 |  |  | $ | 13,640,000 |  |  | $ | 4,556,000 |
Schedule of Tax Effects of Temporary Differences that Gave Rise to Deferred Tax Assets and Liabilities | The tax effects of temporary differences that gave rise to deferred tax assets and liabilities as of January 31, 2014 and 2013 are presented below:
|  | 2014 |  |  | 2013 |
Assets: |  |  |  |  |  |  |  |
Purchased intangibles |  | $ | 1,255,000 |  |  | $ | 1,407,000 |
Stock options |  |  | 1,623,000 |  |  |  | 1,675,000 |
Accrued liabilities |  |  | 514,000 |  |  |  | 855,000 |
Moxie Project net operating losses |  |  | — |  |  |  | 432,000 |
Other |  |  | 50,000 |  |  |  | 144,000 |
|  |  | 3,442,000 |  |  |  | 4,513,000 |
Liabilities: |  |  |  |  |  |  |  |
Purchased intangibles |  |  | (2,563,000 | ) |  |  | (2,258,000 | )
Property and equipment |  |  | (612,000 | ) |  |  | (581,000 | )
Long-term contracts |  |  | (313,000 | ) |  |  | — |
Other |  |  | (68,000 | ) |  |  | (35,000 | )
|  |  | (3,556,000 | ) |  |  | (2,874,000 | )
Net deferred tax (liabilities) assets |  | $ | (114,000 | ) |  | $ | 1,639,000 |

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