Accounts Receivable (Schedule Of Total Accounts Receivable) (Details) (USD $)	Jun. 30, 2012	Jun. 30, 2011
Accounts Receivable [Abstract]
Allowance for doubtful accounts receivable	$ 3,600,000	$ 3,700,000
Billed receivables	481,268,000	452,533,000
Billable receivables at end of period	84,243,000	66,587,000
Unbilled receivables pending receipt of contractual documents authorizing billing	63,331,000	53,922,000
Total accounts receivable, current	628,842,000	573,042,000
Unbilled receivables, retainages and fee withholdings expected to be billed beyond the next 12 months	9,942,000	8,657,000
Total accounts receivable	$ 638,784,000	$ 581,699,000