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Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Nov. 30, 2014	Nov. 30, 2013	Nov. 30, 2014	Nov. 30, 2013
Consolidated Statements Of Comprehensive Income [Abstract]
Net earnings	$ 130,049us-gaap_NetIncomeLoss	$ 106,452us-gaap_NetIncomeLoss	$ 454,220us-gaap_NetIncomeLoss	$ 393,377us-gaap_NetIncomeLoss
Retirement plans:
Net change in retirement benefit plan unrecognized actuarial losses	214us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	(25)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	640us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	501us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent
Cash flow hedges:
Net change in cash flow hedge unrecognized losses	(1,605)us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	(3,193)us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	(227)us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	2,180us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent
Other comprehensive income (loss), net of taxes	(1,391)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	(3,218)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	413us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	2,681us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
TOTAL COMPREHENSIVE INCOME	$ 128,658us-gaap_ComprehensiveIncomeNetOfTax	$ 103,234us-gaap_ComprehensiveIncomeNetOfTax	$ 454,633us-gaap_ComprehensiveIncomeNetOfTax	$ 396,058us-gaap_ComprehensiveIncomeNetOfTax

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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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