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Consolidated Statements of Comprehensive Earnings - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net Earnings	$ 198,219	$ 152,592	$ 186,853
Net Actuarial Change in Defined Benefit Plans:
Unrealized (gain) loss during the period, net of tax expense (benefit) of $1,554, ($488) and ($3,746)	(2,765)	613	6,173
Amortization of Net Actuarial Loss, net of tax benefit of $752, $760 and $242	1,248	1,271	411
Comprehensive Earnings	$ 202,232	$ 153,250	$ 193,437

X

- Definition

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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=51831270

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-Publisher FASB
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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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Amount after tax of (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, that has not been recognized in net periodic benefit (cost) credit.

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