Benefit Plans (Stock Grant Fair Value Assumptions) (Details) - $ / shares	12 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	0.00%	0.00%	0.00%
Expected volatility	57.53%	52.28%	48.94%
Average risk-free interest rate	0.59%	1.58%	3.01%
Expected life	6 years 3 months 18 days	6 years 3 months 18 days	6 years 8 months 12 days
Target 1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
EPS Targets (in dollars per share)	$ 16.35
Restricted Stock Eligible for Vesting (in hundredths)	40.00%
Target 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
EPS Targets (in dollars per share)	$ 20.45
Restricted Stock Eligible for Vesting (in hundredths)	60.00%
Target 3
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
EPS Targets (in dollars per share)	$ 25.30
Restricted Stock Eligible for Vesting (in hundredths)	100.00%

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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- Definition

The vesting percentage of restricted stock vesting.

+ References

No definition available.

+ Details

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- Definition

Share-Based Compensation Arrangement by Share-based Payment Award, Terms Of Award, Earnings Per Share Target

+ References

No definition available.

+ Details

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