Contingencies - Warranty (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$ 16,133	$ 18,699	$ 17,916	$ 25,821
Accruals for warranties issued	1,963	1,344	5,191	3,158
Changes in liability related to warranties existing in prior periods	(565)	(504)	(1,916)	(3,187)
Payments made	(1,497)	(2,285)	(5,157)	(8,538)
Balance at end of period	$ 16,034	$ 17,254	$ 16,034	$ 17,254