Contingencies - Litigation and Other Matters (Details) - USD ($)	3 Months Ended	6 Months Ended
	Mar. 31, 2016	Mar. 31, 2016	Mar. 31, 2017	Sep. 30, 2016
Loss Contingencies [Line Items]
Estimated Litigation Liability			$ 0
DPA And HUD
Loss Contingencies [Line Items]
Loss contingency accrual provision	$ 1,100,000	$ 2,300,000
Legal Reserve
Loss Contingencies [Line Items]
Accrued amounts for litigation and other contingent liabilities			4,000,000	$ 10,200,000
Performance Bonds
Loss Contingencies [Line Items]
Letters of credit secured using cash collateral			52,400,000
Outstanding performance bonds			$ 210,500,000