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Inventories - Effect of Accounting Changes on Prior Consolidated Statement of Cash Flows (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2019 | Jan. 31, 2019 | Oct. 31, 2018 | Jul. 31, 2018 | Apr. 30, 2018 | Jan. 31, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2019 | Apr. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Net earnings | $ (1,197) | $ 15 | $ 1,454 | $ 1,416 | $ 1,613 | $ 888 | $ 1,765 | $ 1,192 | $ 1,688 | $ 5,458
Change in assets and liabilities: |  |  |  |  |  |  |  |  |  |
Inventories |  |  |  |  |  |  |  |  | 456 | (2,866)
Accounts payable and other accrued expenses |  |  |  |  |  |  |  |  | (55) | 4,606
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 2,490 | 3,183
As Previously Reported |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Net earnings |  |  |  |  |  |  |  |  |  | 5,365
Change in assets and liabilities: |  |  |  |  |  |  |  |  |  |
Inventories |  |  |  |  |  |  |  |  |  | (2,727)
Accounts payable and other accrued expenses |  |  |  |  |  |  |  |  |  | 4,560
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  | 3,183
Adjustments |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Net earnings |  |  |  |  |  |  |  |  | (340) |
Change in assets and liabilities: |  |  |  |  |  |  |  |  |  |
Inventories |  |  |  |  |  |  |  |  | 444 |
Net cash provided by operating activities |  |  |  |  |  |  |  |  | $ 0 |
LIFO/FIFO | Adjustments |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Net earnings |  |  |  |  |  |  |  |  |  | 93
Change in assets and liabilities: |  |  |  |  |  |  |  |  |  |
Inventories |  |  |  |  |  |  |  |  |  | (139)
Accounts payable and other accrued expenses |  |  |  |  |  |  |  |  |  | 46
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  | $ 0

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