The amounts in accumulated other comprehensive income related to gains and losses that are not recognized immediately and are expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.

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The amounts in accumulated other comprehensive income related to prior service cost or credit expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.

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The effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

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The effect of a one-percentage-point increase in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

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The employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.

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The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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The ultimate trend rate for health care costs.

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The year when the ultimate health care cost trend rate is expected to be reached.

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The amount of pension and other (such as medical, dental and life insurance) postretirement benefit costs recognized during the period for (1) defined benefit plans (periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss) on assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments) and for (2) defined contribution plans (to the extent that a plan's defined contributions to an individual's account are to be made for periods in which that individual renders services, the net cost for a period is the contribution called for in that period; if a plan calls for contributions for periods after an individual retires or terminates, the estimated cost is accrued during the employee's service period).

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Defined benefit plan, percentage of total plan assets

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Pension And Other Postretirement Benefit Plans (Narrative) (Details) (USD $)	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Revised healthcare cost trend assumption	7.80%
Ultimate healthcare cost trend rate	4.50%
Year that rate reaches healthcare cost trend rate	2028
Effect of one-percentage-point increase on accumulated postretirement benefit obligation	$ 1,800,000
Effect of one-percentage-point decrease on accumulated postretirement benefit obligation	1,600,000
Net actuarial loss expected in net periodic benefit cost during fiscal year 2013	10,600,000
Prior service benefit expected in net periodic benefit cost during fiscal year 2013	700,000
Percentage of total plan assets	89.00%
Percentage of total projected benefit obligation	79.00%
Expected company contributions in 2013	16,900,000
Amounts charged to expense for the plan	1,100,000	1,300,000	1,400,000
ERISA-regulated U.S. plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected company contributions in 2013	6,500,000
Non-ERISA regulated and Other Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected company contributions in 2013	$ 10,400,000