Accumulated Other Comprehensive Income (Loss) - Schedule (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2021	Feb. 29, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 454,343	$ 613,810	$ 454,872	$ 614,815
Other comprehensive income (loss), net of tax	12	8	3,287	88
Ending Balance	454,936	610,475	454,936	610,475
Accumulated other comprehensive income (loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	1,934	(1,272)	(1,341)	(1,352)
Ending Balance	1,946	$ (1,264)	1,946	$ (1,264)
Foreign currency translation income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	1,934		(1,341)
Other comprehensive income before reclassifications, net of tax	12		3,287
Amounts reclassified from accumulated other comprehensive loss	0		0
Other comprehensive income (loss), net of tax	12		3,287
Ending Balance	$ 1,946		$ 1,946

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount before tax and reclassification adjustments of other comprehensive income (loss) attributable to parent.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Amount after tax of reclassification adjustments of other comprehensive income (loss) attributable to parent.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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