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Inventory (Tables) | 12 Months Ended
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Mar. 31, 2018
Inventory [Abstract] |
Non-core inventory | Non-core inventory, inventory unreturned, long-term core inventory, and long-term core inventory deposits are as follows at March 31:
|  | 2018 |  |  | 2017 |
Non-core inventory |  |  |  |  |  |
Raw materials |  | $ | 25,805,000 |  |  | $ | 21,515,000 |
Work in process |  |  | 635,000 |  |  |  | 641,000 |
Finished goods |  |  | 53,973,000 |  |  |  | 48,337,000 |
|  |  | 80,413,000 |  |  |  | 70,493,000 |
Less allowance for excess and obsolete inventory |  |  | (4,138,000 | ) |  |  | (2,977,000 | )
Total |  | $ | 76,275,000 |  |  | $ | 67,516,000 |
Inventory unreturned |  | $ | 7,508,000 |  |  | $ | 7,581,000 |
Long-term core inventory |
Long-term core inventory |  |  |  |  |  |  |  |
Used cores held at the Company's facilities |  | $ | 53,278,000 |  |  | $ | 38,713,000 |
Used cores expected to be returned by customers |  |  | 12,970,000 |  |  |  | 11,752,000 |
Remanufactured cores held in finished goods |  |  | 34,201,000 |  |  |  | 27,667,000 |
Remanufactured cores held at customers' locations (1) |  |  | 203,751,000 |  |  |  | 185,938,000 |
|  |  | 304,200,000 |  |  |  | 264,070,000 |
Less allowance for excess and obsolete inventory |  |  | (2,544,000 | ) |  |  | (1,148,000 | )
Total |  | $ | 301,656,000 |  |  | $ | 262,922,000 |
Long-term core inventory deposits |  | $ | 5,569,000 |  |  | $ | 5,569,000 |
(1) | Remanufactured cores held at customers’ locations represent the core portion of the Company’s customers’ finished goods at the Company’s customers’ locations.

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- Definition Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(c)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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