XML 141 R52.htm IDEA: XBRL DOCUMENT v2.4.0.8
Accounts Receivable, net (Details) (USD $)
May 31, 2013
May 31, 2012
Accounts Receivable, net    
Trade accounts receivable $ 110,438,000 $ 106,821,000
Allowance for doubtful accounts (1,884,000) (2,306,000)
Accounts receivable, net 108,554,000 104,515,000
Accrued unbilled revenues $ 8,100,000 $ 4,000,000