Summary of Significant Accounting Policies - Schedule of Other Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Sep. 30, 2012
Other Liabilities [Abstract]
Income tax liabilities	$ 20,470		$ 20,170
Accrued warranty expenses	13,781	12,561	11,663	13,445	13,601	15,477
Accrued interest	23,859		33,372
Accrued and deferred compensation	18,844		25,579
Customer deposits	16,139		11,408
Other	40,605		43,431
Total	$ 133,698		$ 145,623