Accounts Receivable (Schedule Of Total Accounts Receivable) (Details) (USD $)	Jun. 30, 2011	Jun. 30, 2010
Accounts Receivable
Allowance for doubtful accounts receivable	$ 3,700,000	$ 3,200,000
Billed receivables	452,533,000	393,094,000
Billable receivables at end of period	66,587,000	84,107,000
Unbilled receivables pending receipt of contractual documents authorizing billing	53,922,000	53,832,000
Total accounts receivable, current	573,042,000	531,033,000
Unbilled receivables, retainages and fee withholdings expected to be billed beyond the next 12 months	8,657,000	9,291,000
Total accounts receivable	$ 581,699,000	$ 540,324,000