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The Company and Its Accounting Policies - Cumulative Effect of New Revenue Recognition Standard Adoption Changes on Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Apr. 01, 2018 | Mar. 31, 2018
--- | --- | --- | ---
Assets |  |  |
Trade accounts receivable, net of allowances | $ 17,582 |  | $ 17,026
Unbilled revenue | 7,522 | $ 6,092 | 8,079
Inventories | 24,670 |  | 11,566
Prepaid expenses and other current assets | 1,333 |  | 772
Assets held for sale | 4,850 |  |
Other assets | 149 |  | 202
Liabilities |  |  |
Accounts payable | 12,405 |  | 16,151
Accrued compensation | 5,126 |  | 4,958
Accrued expenses and other current liabilities | 2,933 |  | 2,885
Customer deposits | 30,847 | 26,585 | 13,213
Liabilities held for sale | 3,525 |  |
Deferred income tax liability | 1,056 |  | 1,427
Stockholders' equity: |  |  |
Retained earnings | 93,847 |  | $ 99,011
ASU 2014-09 [Member] |  |  |
Assets |  |  |
Trade accounts receivable, net of allowances |  | 17,564 |
Unbilled revenue |  | 6,092 |
Inventories |  | 24,551 |
Prepaid expenses and other current assets |  | 890 |
Other assets |  | 271 |
Liabilities |  |  |
Accounts payable |  | 15,445 |
Accrued compensation |  | 4,786 |
Accrued expenses and other current liabilities |  | 3,369 |
Customer deposits |  | 26,585 |
Deferred income tax liability |  | 1,194 |
Stockholders' equity: |  |  |
Retained earnings |  | 97,989 |
ASU 2014-09 [Member] | Adjustments Due to Adoption of Revenue Recognition Standard [Member] |  |  |
Assets |  |  |
Trade accounts receivable, net of allowances | 2,631 | 538 |
Unbilled revenue | 138 | (1,987) |
Inventories | 12,117 | 12,985 |
Prepaid expenses and other current assets | 133 | 118 |
Assets held for sale | 1,248 |  |
Other assets | 8 | 69 |
Liabilities |  |  |
Accounts payable | 189 | (706) |
Accrued compensation | (170) | (172) |
Accrued expenses and other current liabilities | 76 | 484 |
Customer deposits | 16,040 | 13,372 |
Liabilities held for sale | 1,264 |  |
Deferred income tax liability | (254) | (233) |
Stockholders' equity: |  |  |
Retained earnings | $ (870) | $ (1,022) |

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