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Consolidated Statements of Comprehensive Earnings (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net Earnings	$ 29,819	$ 50,319	$ 67,581	$ 88,029
Change in Funded Status of Defined Benefit Plans:
Amortization of Net Actuarial Loss	508	163	1,016	326
Tax Expense	(188)	(57)	(376)	(114)
Comprehensive Earnings	$ 30,139	$ 50,425	$ 68,221	$ 88,241

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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

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