Summary of Significant Accounting Policies - Schedule of Other Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Sep. 30, 2010
Other Liabilities [Abstract]
Income tax liabilities	$ 21,457		$ 55,093
Accrued warranty expenses	16,034	16,133	17,916	17,254	18,699	25,821
Accrued interest	18,021		39,478
Accrued and deferred compensation	19,460		27,427
Customer deposits	9,743		5,868
Other	41,049		66,405
Total	$ 125,764		$ 212,187