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Warranty - Reconciliation of Accrued Warranty (Detail) - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2015	Aug. 31, 2014	May. 31, 2015
Guarantees [Abstract]
Balance at the beginning of the period	$ 6,911	$ 5,697
Accruals for warranties	1,545	1,695
Settlements made during the period	(1,574)	(1,731)
Balance at the end of the period	6,882	5,661
Non-current balance included in other deferred liabilities	2,400	2,000	$ 2,400
Accrued warranty	$ 4,482	$ 3,661	$ 4,511

X

- Definition

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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