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Basis of Presentation - Narrative (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Jul. 31, 2021 | Jul. 31, 2020 | Apr. 30, 2021 | Apr. 30, 2020
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Percentage of LIFO Inventory | 43.00% |  | 43.00% |
Inventories | $ 181,794,000 |  | $ 158,167,000 |
Deferred Tax Assets, Net of Valuation Allowance | 1,557,000 |  | 1,118,000 |
Retained earnings | 432,137,000 |  | 448,282,000 | $ 403,193,000
Net Cash Provided by (Used in) Operating Activities | 6,588,000 | $ 40,000,000 |  |
Impairment charges related to goodwill | 0 | 0 |  |
Other intangible assets |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Impairment charges related to other intangible assets | $ 0 | 0 |  |
Maximum |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Intangible assets estimated useful lives | 6 years |  |  |
Revision of Prior Period, Change in Accounting Principle, Adjustment |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Inventories | $ 2,204,000 |  | 17,885,000 |
Deferred Tax Assets, Net of Valuation Allowance |  |  | 4,500,000 |
Retained earnings | $ 1,629,000 |  | $ 13,342,000 | $ 10,912,000
Net Cash Provided by (Used in) Operating Activities |  | $ 1,600,000 |  |

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