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Unaudited Condensed Consolidated Statement Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 122,669us-gaap_NetIncomeLoss	$ 73,300us-gaap_NetIncomeLoss	$ 168,887us-gaap_NetIncomeLoss	$ 156,697us-gaap_NetIncomeLoss
Other comprehensive gains (losses):
Unrealized holding gains (losses)	1,892	(580)	2,957	(1,324)
Gains/(losses) reclassified to net income	(227)	539	(267)	921
Total other comprehensive income (loss)	1,665	(41)	2,690	(403)
Comprehensive income	$ 124,334us-gaap_ComprehensiveIncomeNetOfTax	$ 73,259us-gaap_ComprehensiveIncomeNetOfTax	$ 171,577us-gaap_ComprehensiveIncomeNetOfTax	$ 156,294us-gaap_ComprehensiveIncomeNetOfTax

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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- Definition

Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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