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ACCOUNTS RECEIVABLE - Schedule of accounts receivable (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Jun. 30, 2014
Accounts Receivable [Abstract]    
Billed receivables $ 444,869 $ 473,527
Billable receivables at end of period 102,796 84,784
Unbilled receivables pending receipt of contractual documents authorizing billing 48,490 57,269
Total accounts receivable, current 596,155 615,580
Unbilled receivables, retainages and fee withholdings expected to be billed beyond the next 12 months 8,188 8,714
Total accounts receivable $ 604,343 $ 624,294