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Consolidated Statements Comprehensive Income (Loss) - USD ($)
$ in Thousands
 12 Months Ended
May 31, 2016
May 31, 2015
May 31, 2014
Statement of Comprehensive Income [Abstract]      
Net income (loss) $ (43,590) $ (3,388) $ 2,347
Other comprehensive (loss) income, before tax:      
Unrealized gain (loss) on marketable securities (11) (120) (16)
Unrealized gain (loss) on interest rate swap 257 296 (32)
Foreign currency translation gain (loss) (112) (264) 442
Other comprehensive income (loss), before tax 134 (88) 394
Income tax benefit (expense) related to items of other comprehensive income (loss) (92) (64) 18
Other comprehensive income (loss), net of tax 42 (152) 412
Total comprehensive income (loss), net of tax $ (43,548) $ (3,540) $ 2,759