Contingencies - Litigation and Other Matters (Details) - USD ($)	3 Months Ended	9 Months Ended
	Jun. 30, 2016	Jun. 30, 2016	Jun. 30, 2017	Sep. 30, 2016
Loss Contingencies [Line Items]
Estimated Litigation Liability			$ 0
DPA And HUD
Loss Contingencies [Line Items]
Loss contingency accrual provision	$ 1,900,000	$ 4,200,000
Legal Reserve
Loss Contingencies [Line Items]
Accrued amounts for litigation and other contingent liabilities			4,400,000	$ 10,200,000
Performance Bonds
Loss Contingencies [Line Items]
Letters of credit secured using cash collateral			51,000,000
Outstanding performance bonds			$ 208,600,000