Note 13 - Accumulated Other Comprehensive (Loss) Income (Details) - Changes in Accumulated Other Comprehensive Loss (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2015	Feb. 28, 2014
Changes in Accumulated Other Comprehensive Loss [Abstract]
Foreign exchange translation adjustment, pretax			$ (26,246)	$ 5,023
Foreign exchange translation adjustment, after tax			(27,677)	5,023
Foreign exchange translation adjustment, tax			1,431
Changes in fair value of cash flow hedges, pretax			553	362
Changes in fair value of cash flow hedges, tax			242	108
Changes in fair value of cash flow hedges, after tax	114	109	311	254
Other comprehensive income (loss), pretax			(25,693)	5,385
Other comprehensive income (loss), tax			1,673us-gaap_OtherComprehensiveIncomeLossTax	108us-gaap_OtherComprehensiveIncomeLossTax
Other comprehensive income (loss), after tax			$ (27,366)	$ 5,277

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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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