Summary Of Significant Accounting Policies (Schedule Of Non-Cash Expenditures) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Sep. 30, 2012	Sep. 30, 2011
Summary Of Significant Accounting Policies [Abstract]
Non-Cash Capital Expenditure, Non-Cash Investing Activity	$ 77,093	$ 149,550	$ 67,503	$ 125,115