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Inventories - Additional Information (Detail) - USD ($)	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
Inventories [Line Items]
LIFO inventory reserve	$ 1,000,000	$ 1,200,000
Increase or decrease in cost of sales as a result of liquidation of LIFO inventory	158,000	137,000
International Subsidiaries [Member]
Inventories [Line Items]
Inventories measured using FIFO method	$ 1,906,000	$ 1,684,000
Maximum [Member]
Inventories [Line Items]
LIFO index	100.00%	100.00%

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- Definition

Inventories [Line Items]

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- Definition

The effect of liquidating LIFO (last in first out) inventory layers on income.

+ References

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-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



-Section S99



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The amount of FIFO (first in first out) inventory present at the reporting date when inventory is also valued using different valuation methods.

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Amount of difference between inventory at lower of LIFO cost or market and inventory at lower of other inventory accounting method cost or market, for example, but not limited to, FIFO or average cost.

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The percentage of LIFO (last in first out) inventory to total inventory as of the balance sheet date if other than 100 percent.

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