Summary of Changes in Other Comprehensive Income Included Within Shareholders Equity (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Nov. 30, 2014	Nov. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	$ (2,679)	$ (1,789)
Other comprehensive income (loss) before tax	(4,723)	(139)
Non-controlling interest	37	8
Balance, end of period	(7,365)	(1,920)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(5,145)	(3,532)
Other comprehensive income (loss) before tax	(6,939)	(210)
Non-controlling interest	37	8
Balance, end of period	(12,047)	(3,734)
Foreign Currency Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	1,229	2,004
Other comprehensive income (loss) before tax	1,439	(762)
Balance, end of period	2,668	1,242
Tax Provision
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	1,237	(261)
Other comprehensive income (loss) before tax	777	833
Balance, end of period	$ 2,014	$ 572

- Definition

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.

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