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Income Taxes (Tables) | 12 Months Ended
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Mar. 31, 2018
Income Tax Disclosure [Abstract] |
Summary of Income Tax Provision | The income tax provision consisted of the following for the fiscal years ended March 31, 2018, 2017 and 2016:
|  | 2018 |  |  | 2017 |  |  | 2016 |
Current — Federal |  | $ | 11,177,000 |  |  | $ | 16,456,000 |  |  | $ | 16,600,000 |
Current — State |  |  | 1,905,000 |  |  |  | 2,834,000 |  |  |  | 2,591,000 |
Subtotal |  |  | 13,082,000 |  |  |  | 19,290,000 |  |  |  | 19,191,000 |
Deferred — Federal |  |  | (955,000 | ) |  |  | (1,508,000 | ) |  |  | (1,679,000 | )
Deferred — State |  |  | 81,000 |  |  |  | 288,000 |  |  |  | 23,000 |
Subtotal |  |  | (874,000 | ) |  |  | (1,220,000 | ) |  |  | (1,656,000 | )
|  | $ | 12,208,000 |  |  | $ | 18,070,000 |  |  | $ | 17,535,000 |
Summary of Reconciliation Income Tax Provision from the Statutory Federal Income Tax Rate | The following is a reconciliation of the income tax provision from the statutory federal income tax rate to the effective rate for the fiscal years ended March 31, 2018, 2017 and 2016:
|  | 2018 |  |  | 2017 |  |  | 2016 |
Income taxes at federal statutory rate |  | $ | 15,112,000 |  |  | $ | 16,643,000 |  |  | $ | 16,121,000 |
State income taxes, net of federal benefit |  |  | 1,645,000 |  |  |  | 1,973,000 |  |  |  | 1,704,000 |
Uncertain tax positions |  |  | (464,000 | ) |  |  | 88,000 |  |  |  | 78,000 |
Permanent items and tax credits |  |  | (1,364,000 | ) |  |  | (705,000 | ) |  |  | (100,000 | )
Adjustments to returns as filed |  |  | 138,000 |  |  |  | 80,000 |  |  |  | (232,000 | )
Valuation allowance |  |  | 236,000 |  |  |  | — |  |  |  | — |
Impact of tax reform |  |  | (3,095,000 | ) |  |  | — |  |  |  | — |
Other |  |  | — |  |  |  | (9,000 | ) |  |  | (36,000 | )
|  | $ | 12,208,000 |  |  | $ | 18,070,000 |  |  | $ | 17,535,000 |
Summary of Deferred Tax Assets and Liabilities | Deferred tax assets and liabilities at March 31, 2018 and 2017 are:
|  | 2018 |  |  | 2017 |
Deferred tax assets: |  |  |  |  |  |  |  |
Accrued liabilities not currently deductible |  | $ | 5,703,000 |  |  | $ | 9,409,000 |
Allowance for doubtful accounts |  |  | 1,151,000 |  |  |  | 1,153,000 |
Stock-based compensation |  |  | 1,631,000 |  |  |  | 1,755,000 |
Accrued rent |  |  | 1,555,000 |  |  |  | 2,219,000 |
Other |  |  | 896,000 |  |  |  | 740,000 |
Deferred tax assets |  |  | 10,936,000 |  |  |  | 15,276,000 |
Deferred tax liabilities: |  |  |  |  |  |  |  |
Excess of book over tax basis of fixed assets |  |  | (11,191,000 | ) |  |  | (15,666,000 | )
Intangible assets |  |  | (4,169,000 | ) |  |  | (5,960,000 | )
Other |  |  | (179,000 | ) |  |  | (336,000 | )
Total deferred tax liabilities |  |  | (15,539,000 | ) |  |  | (21,962,000 | )
Valuation allowance |  |  | (236,000 | ) |  |  | — |
Deferred tax liabilities |  |  | (15,775,000 | ) |  |  | (21,962,000 | )
Net deferred tax liability |  | $ | (4,839,000 | ) |  | $ | (6,686,000 | )
Reconciliation of the Financial Statement Recognition and Measurement of Uncertain Tax Positions During the Current Fiscal Year | A reconciliation of the financial statement recognition and measurement of uncertain tax positions during the current fiscal year is as follows:
Balance as of March 31, 2017 |  | $ | 1,884,000 |
Additions based on tax positions related to the current year |  |  | 236,000 |
Additions for tax positions of prior years |  |  | 8,000 |
Reductions for tax positions related to the current year |  |  | 0 |
Reductions for tax positions of prior years |  |  | (656,000 | )
Balance as of March 31, 2018 |  | $ | 1,472,000 |

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