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Discontinued Operations - Results of Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2015	Feb. 28, 2014
Discontinued Operations and Disposal Groups [Abstract]
Net Sales	$ 52us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue	$ 8,603us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue	$ 9,767us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue	$ 26,989us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
Operating loss of discontinued operations	(86)us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	(1,806)us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	(5,944)us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	(3,669)us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss
Loss on disposal of discontinued operations			(231)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax
Loss before income taxes	(86)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	(1,806)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	(6,175)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	(3,669)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
Income tax benefit	0us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod	0us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod	0us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod	0us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod
Loss from discontinued operations,net of taxes	$ (86)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	$ (1,806)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	$ (6,175)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	$ (3,669)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax

X

- Definition

Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Pretax income (loss) from operations of a business component (exclusive of any gain (loss) on disposal, or provision therefore) during the reporting period, until its disposal.

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Income tax expense or benefit attributable to Income or Loss from discontinued operations during the phase-out period.

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Amount of operating income or loss attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

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Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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