Accruals for Self Insurance and Other Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Sep. 30, 2011
Summary of the assets and liabilities related to the Company's insurance programs
Current	$ 192,415	$ 166,195
Total assets	1,043,551	1,010,850
Current liability	154,577	154,167
Long-term debt, less current portion	752,985	754,742
Accounting Standards Update 2010-24 [Member]
Summary of the assets and liabilities related to the Company's insurance programs
Current		187,100
Total assets		1,046,800
Current liability		148,000
Total Liabilities		1,078,000
Anticipated Insurance Recoveries [Member] | Accounting Standards Update 2010-24 [Member]
Summary of the assets and liabilities related to the Company's insurance programs
Current	12,640	20,872
Long term	22,720	15,110
Total assets	35,360	35,982
Self-insured liabilities [Member] | Accounting Standards Update 2010-24 [Member]
Summary of the assets and liabilities related to the Company's insurance programs
Current liability	31,089	36,149
Long-term debt, less current portion	58,562	42,125
Total Liabilities	$ 89,651	$ 78,274