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Inventories | 9 Months Ended
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Jan. 31, 2018
Inventory, Net [Abstract] |
Inventories | Inventories The components of inventories were:
|  | January 31, |  | April 30,
(in thousands) |  | 2018 |  | 2017
Raw materials |  | $ | 49,503 |  |  | $ | 18,230 |
Work-in-process |  | 40,330 |  |  | 18,704 |
Finished goods |  | 31,617 |  |  | 19,372 |
Total FIFO inventories |  | 121,450 |  |  | 56,306 |
Reserve to adjust inventories to LIFO value |  | (13,447 | ) |  | (13,447 | )
Total inventories |  | $ | 108,003 |  |  | $ | 42,859 |
Interim LIFO calculations are based on management’s estimates of expected year-end inventory levels and costs. Since these items are estimated, interim results are subject to the final year-end LIFO inventory valuation.

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + 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) -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 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 + Details
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- References No definition available. + Details
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