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Accumulated Other Comprehensive Income (Loss) - Schedule of Before Tax Income (Loss) Related Income Tax effect and Accumulated Balances (Detail) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (7,626)	$ (7,880)	$ (6,273)
Effect of changes in tax rates	31	89	61
Foreign currency translation adjustment	231	(217)	(346)
Change in fair value of cash flow hedges	104	37	8
Change in unrecognized actuarial loss on pension obligations	1,609	716	(2,049)
Income tax effect	(668)	(371)	719
Ending Balance	(6,319)	(7,626)	(7,880)
Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(104)	(127)	(132)
Effect of changes in tax rates	1	1	(2)
Foreign currency translation adjustment	0	0	0
Change in fair value of cash flow hedges	104	37	8
Change in unrecognized actuarial loss on pension obligations	0	0	0
Income tax effect	(41)	(15)	(1)
Ending Balance	(40)	(104)	(127)
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(1,228)	(1,011)	(665)
Effect of changes in tax rates	0	0	0
Foreign currency translation adjustment	231	(217)	(346)
Change in fair value of cash flow hedges	0	0	0
Change in unrecognized actuarial loss on pension obligations	0	0	0
Income tax effect	0	0	0
Ending Balance	(997)	(1,228)	(1,011)
Minimum Pension Liability Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(6,294)	(6,742)	(5,476)
Effect of changes in tax rates	30	88	63
Foreign currency translation adjustment	0	0	0
Change in fair value of cash flow hedges	0	0	0
Change in unrecognized actuarial loss on pension obligations	1,609	716	(2,049)
Income tax effect	(627)	(356)	720
Ending Balance	$ (5,282)	$ (6,294)	$ (6,742)

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

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-Name Accounting Standards Codification
-Topic 220
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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

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Amount before tax, after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount before tax, after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount before tax of (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, that has not been recognized in net periodic benefit (cost) credit.

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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