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Warranty - Reconciliation of Accrued Warranty and Related Expenses (Detail) - USD ($) $ in Thousands	12 Months Ended
	May. 31, 2015	May. 31, 2014
Guarantees [Abstract]
Balance at the beginning of the period	$ 5,697	$ 5,882
Accruals for warranties	8,395	5,224
Settlements made during the period	(7,181)	(5,409)
Balance at the end of the period	6,911	5,697
Non-current balance included in other deferred liabilities	2,400	2,000
Accrued warranty and related expenses	$ 4,511	$ 3,697

X

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Amount of refund payments made to customers during the period.

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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.

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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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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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