Note 13 - Accumulated Other Comprehensive (Loss) Income (Details) - Changes in Accumulated Other Comprehensive Loss (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Nov. 30, 2014	Nov. 30, 2013	Nov. 30, 2014	Nov. 30, 2013
Changes in Accumulated Other Comprehensive Loss [Abstract]
Foreign exchange translation adjustment, pretax			$ (13,625)	$ 4,547
Foreign exchange translation adjustment, after tax			(13,762)	4,547
Foreign exchange translation adjustment, tax			137
Changes in fair value of cash flow hedges, pretax			367	204
Changes in fair value of cash flow hedges, tax			170	59
Changes in fair value of cash flow hedges, after tax	79	(180)	197	145
Other comprehensive income (loss), pretax			(13,258)	4,751
Other comprehensive income (loss), tax			307us-gaap_OtherComprehensiveIncomeLossTax	59us-gaap_OtherComprehensiveIncomeLossTax
Other comprehensive income (loss), after tax			$ (13,565)	$ 4,692

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Amount before tax, after reclassification adjustments of other comprehensive income (loss).

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Amount before tax, after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount of tax expense (benefit), after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount before tax, after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount of tax expense (benefit), after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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