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Consolidated Statements Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2018	May 31, 2017	May 31, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 16,335	$ 5,008	$ (43,590)
Other comprehensive income (loss), before tax:
Unrealized gain (loss) on marketable securities	102	12	(11)
Unrealized gain on interest rate swap	0	0	257
Foreign currency translation gain (loss)	270	(545)	(112)
Other comprehensive income (loss), before tax	372	(533)	134
Income tax benefit (expense) related to items of other comprehensive income (loss)	0	0	(92)
Other comprehensive income (loss), net of tax	372	(533)	42
Total comprehensive income (loss), net of tax	$ 16,707	$ 4,475	$ (43,548)

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