Summary of Significant Accounting Policies - Schedule of Other Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012
Other Liabilities [Abstract]
Income tax liabilities	$ 20,358		$ 20,170
Accrued warranty expenses	12,561	11,911	11,663	13,601	14,342	15,477
Accrued interest	33,907		33,372
Accrued and deferred compensation	14,102		25,579
Customer deposits	13,847		11,408
Other	38,900		43,431
Total	$ 133,675		$ 145,623