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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Aug. 31, 2016
May 31, 2016
Statement of Financial Position [Abstract]    
Accounts receivable, allowances for doubtful accounts $ 326 $ 353
Allowance for doubtful other receivables, current $ 5,106 $ 4,868
Preferred stock, par value (in USD per share) $ 0 $ 0
Preferred stock, shares authorized (in shares) 5,000,000 5,000,000
Preferred stock, shares issued (in shares) 0 0
Common stock, par value (in USD per share) $ 0 $ 0
Common stock, shares authorized (in shares) 200,000,000 200,000,000
Common stock, shares issued (in shares) 153,684,060 154,421,585
Common stock, shares outstanding (in shares) 153,684,060 154,421,585