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Condensed Consolidated Statements of Comprehensive Income (unaudited) (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	$ 79,589us-gaap_NetIncomeLoss	$ 76,110us-gaap_NetIncomeLoss	$ 118,428us-gaap_NetIncomeLoss	$ 121,396us-gaap_NetIncomeLoss
Other comprehensive income:
Reclassifications of net losses on derivative instruments (net of tax of $(278), $(278), $(556) and $(556), respectively)	392	392	783	783
Benefit plans reclassifications of actuarial losses and prior service costs (net of tax of $(92), $(67), $(183) and $(137), respectively)	129	95	260	193
Other comprehensive income	521	487	1,043	976
Comprehensive income	$ 80,110us-gaap_ComprehensiveIncomeNetOfTax	$ 76,597us-gaap_ComprehensiveIncomeNetOfTax	$ 119,471us-gaap_ComprehensiveIncomeNetOfTax	$ 122,372us-gaap_ComprehensiveIncomeNetOfTax

- Definition

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

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