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Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 52,807us-gaap_NetIncomeLoss	$ 47,167us-gaap_NetIncomeLoss	$ 189,206us-gaap_NetIncomeLoss	$ 185,293us-gaap_NetIncomeLoss
Change in postretirement plan costs, net of tax	86	419	257	1,952
Comprehensive income	$ 52,893us-gaap_ComprehensiveIncomeNetOfTax	$ 47,586us-gaap_ComprehensiveIncomeNetOfTax	$ 189,463us-gaap_ComprehensiveIncomeNetOfTax	$ 187,245us-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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- Definition

Amount after tax of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans.

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