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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Nov. 30, 2015
May. 31, 2015
Statement of Financial Position [Abstract]    
Accounts receivable, allowances for doubtful accounts $ 437 $ 468
Allowance for doubtful other receivables, current $ 9,091 $ 2,684
Preferred stock, shares authorized (shares) 5,000,000 5,000,000
Preferred stock, shares issued (shares) 0 0
Common stock, shares authorized (shares) 200,000,000 200,000,000
Common stock, shares issued (shares) 129,362,187 130,557,676
Common stock, shares outstanding (shares) 129,362,187 130,557,676