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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (Parenthetical) - USD ($)
$ in Thousands
May 31, 2019
May 31, 2018
Statement of Cash Flows [Abstract]    
Cash and cash equivalents $ 120,315 $ 600,444
Restricted cash 1,991 9,696
Total cash, restricted cash and cash equivalents $ 122,306 $ 610,140