Commitments And Contingencies (Details) (USD $)	1 Months Ended	9 Months Ended
	Apr. 30, 2013	Jun. 30, 2013
Loss Contingencies [Line Items]
Additional bonding capacity		$ 124,400,000
Proceeds from legal settlement	1,700,000
Estimated cost of construction of new facilities		75,000,000
Costs incurred to date		55,700,000
Lease payment		1,200,000
S&I [Member]
Loss Contingencies [Line Items]
Line of credit facility		7,600,000
Guarantee liability		4,900,000
Financial Standby Letter of Credit [Member]
Loss Contingencies [Line Items]
Guarantee liability		18,900,000
Performance Guarantee [Member]
Loss Contingencies [Line Items]
Guarantee liability		$ 275,600,000