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Warranty - Reconciliation of Accrued Warranty and Related Expenses (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Feb. 28, 2015	Feb. 28, 2014	May 31, 2014
Guarantees [Abstract]
Balance at the beginning of the period	$ 5,697us-gaap_ProductWarrantyAccrual	$ 5,882us-gaap_ProductWarrantyAccrual
Accruals for warranties	4,932us-gaap_ProductWarrantyAccrualWarrantiesIssued	4,106us-gaap_ProductWarrantyAccrualWarrantiesIssued
Settlements made during the period	(4,907)us-gaap_CustomerRefundableFeesRefundPayments	(3,867)us-gaap_CustomerRefundableFeesRefundPayments
Balance at the end of the period	5,722us-gaap_ProductWarrantyAccrual	6,121us-gaap_ProductWarrantyAccrual
Non-current balance included in other deferred liabilities	2,000us-gaap_ProductWarrantyAccrualNoncurrent	2,200us-gaap_ProductWarrantyAccrualNoncurrent	2,000us-gaap_ProductWarrantyAccrualNoncurrent
Accrued warranty and related expenses	$ 3,722us-gaap_ProductWarrantyAccrualClassifiedCurrent	$ 3,921us-gaap_ProductWarrantyAccrualClassifiedCurrent	$ 3,697us-gaap_ProductWarrantyAccrualClassifiedCurrent

X

- Definition

Amount of refund payments made to customers during the period.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 10

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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

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-Publisher FASB

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and due after one year (or beyond the operating cycle if longer) for estimated claims under standard and extended warranty protection rights granted to customers.

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Represents the aggregate increase in the liability for accruals related to standard and extended product warranties issued during the reporting period.

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