Equity Compensation (Summary of Market Stock Units Expected to Vest) (Details) - Market Stock Unit (MSUs) shares in Thousands	12 Months Ended
Mar. 31, 2018 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, expected to vest (in shares) \| shares	193
Weighted Average Fair Value, expected to vest \| $ / shares	$ 55.95
Weighted Average Remaining Contractual Term, expected to vest	1 year 4 months 24 days

Weighted average remaining contractual term for fully vested and expected to vest restricted stock units, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

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