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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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