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Employee Benefit Plans (RSU rollforward) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Restricted Stock Units (RSUs)
Number of Shares
Outstanding, beginning of period (in shares)	4,421	5,221	6,181
Vested (in shares)	(1,705)	(2,148)	(2,248)
Canceled or expired (in shares)	(561)	(323)	(333)
Outstanding, end of period (in shares)	3,951	4,421	5,221
Weighted-Average Grant Date Fair Value
Outstanding, beginning of period (in dollars per share)	$ 29	$ 20	$ 14
Vested (in dollars per share)	22
Canceled or expired (in dollars per share)	32
Outstanding, end of period (in dollars per share)	$ 36	$ 29	$ 20
Weighted-Average Remaining Vesting Period
Outstanding. end of period (in years)	1 year 3 months 18 days
Aggregate Fair Value
Vested	$ 76,389	$ 89,159	$ 81,582
Outstanding, March 31, 2020	$ 167,298
Time-based RSUs
Number of Shares
Granted (in shares)	1,431	1,290	1,212
Weighted-Average Grant Date Fair Value
Granted (in dollars per share)	$ 38	$ 40	$ 33
Market-based and performance-based RSUs
Number of Shares
Granted (in shares)	365	381	409
Outstanding, end of period (in shares)	1,000
Weighted-Average Grant Date Fair Value
Granted (in dollars per share)	$ 40	$ 39	$ 33

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Weighted Average Remaining Contractual Terms [Abstract]

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Intrinsic value of outstanding award under share-based payment arrangement. Excludes share and unit options.

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Intrinsic value of vested award under share-based payment arrangement. Excludes share and unit options.

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