Business Acquisitions (Schedule of Purchase Price) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended			3 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Jun. 30, 2011 Business Acquisition, Acquiree - IDS [Member]	Dec. 31, 2012 Business Acquisition, Acquiree - Duarte Business [Member]
Cash paid to seller				$ 48,412	$ 198,900
Less cash acquired				(1,251)	(40)
Total purchase price				47,161	198,860
Business acquisitions, marketable securities acquired	0	0	(8,463)	(8,463)
Price paid for business assets	$ 198,860	$ 0	$ 38,698	$ 38,698