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Impact on Previously Issued Financial Statements for the Correction of an Error, Revised Consolidated Balance Sheet (Details) - USD ($) | Dec. 31, 2018 | Mar. 31, 2018 | Mar. 31, 2017
--- | --- | --- | ---
ASSETS [Abstract] |  |  |
Income tax receivable | $ 12,887,000 | $ 7,972,000 |
Prepaid expenses and other current assets | 7,946,000 | 8,608,000 |
Long-term core inventory - net |  | 0 |
Long-term deferred income taxes | 7,607,000 | 6,698,000 |
Other assets | 891,000 | 804,000 |
TOTAL ASSETS | 605,849,000 | 552,427,000 |
LIABILITIES AND SHAREHOLDERS' EQUITY [Abstract] |  |  |
Accrued liabilities | 13,382,000 | 12,048,000 |
TOTAL LIABILITIES | 326,061,000 | 265,547,000 |
Retained earnings | 74,172,000 | 78,510,000 |
TOTAL SHAREHOLDERS' EQUITY | 279,788,000 | 286,880,000 |
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY | $ 605,849,000 | 552,427,000 |
Historical Misapplication of GAAP Related to Timing of Recognizing Certain Expenses Incurred in Connection with New Business [Member] |  |  |
ASSETS [Abstract] |  |  |
Income tax receivable |  | 7,972,000 |
Prepaid expenses and other current assets |  | 15,104,000 |
Long-term core inventory - net |  | 298,294,000 |
Long-term deferred income taxes |  | 6,937,000 |
Other assets |  | 21,995,000 |
TOTAL ASSETS |  | 505,908,000 |
LIABILITIES AND SHAREHOLDERS' EQUITY [Abstract] |  |  |
Accrued liabilities |  | 12,048,000 |
TOTAL LIABILITIES |  | 219,770,000 |
Retained earnings |  | 77,768,000 | $ 58,942,000
TOTAL SHAREHOLDERS' EQUITY |  | 286,138,000 |
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY |  | 505,908,000 |
Historical Misapplication of GAAP Related to Timing of Recognizing Certain Expenses Incurred in Connection with New Business [Member] | As Previously Reported [Member] |  |  |
ASSETS [Abstract] |  |  |
Income tax receivable |  | 7,796,000 |
Prepaid expenses and other current assets |  | 11,491,000 |
Long-term core inventory - net |  | 301,656,000 |
Long-term deferred income taxes |  | 10,556,000 |
Other assets |  | 7,392,000 |
TOTAL ASSETS |  | 494,497,000 |
LIABILITIES AND SHAREHOLDERS' EQUITY [Abstract] |  |  |
Accrued liabilities |  | 11,799,000 |
TOTAL LIABILITIES |  | 219,521,000 |
Retained earnings |  | 66,606,000 | 50,290,000
TOTAL SHAREHOLDERS' EQUITY |  | 274,976,000 |
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY |  | 494,497,000 |
Historical Misapplication of GAAP Related to Timing of Recognizing Certain Expenses Incurred in Connection with New Business [Member] | Adjustment [Member] |  |  |
ASSETS [Abstract] |  |  |
Income tax receivable |  | 176,000 |
Prepaid expenses and other current assets |  | 3,613,000 |
Long-term core inventory - net |  | (3,362,000) |
Long-term deferred income taxes |  | (3,619,000) |
Other assets |  | 14,603,000 |
TOTAL ASSETS |  | 11,411,000 |
LIABILITIES AND SHAREHOLDERS' EQUITY [Abstract] |  |  |
Accrued liabilities |  | 249,000 |
TOTAL LIABILITIES |  | 249,000 |
Retained earnings |  | 11,162,000 | $ 8,652,000
TOTAL SHAREHOLDERS' EQUITY |  | 11,162,000 |
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY |  | $ 11,411,000 |

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