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Employee Benefit Plans (RSU rollforward) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Restricted Stock Units (RSUs)
Number of Shares
RSUs Outstanding, beginning of period (in shares)	5,521	4,939	6,088
Vested (in shares)	(2,126)	(1,557)	(1,949)
Cancelled or expired (in shares)	(368)	(820)	(1,110)
RSUs Outstanding, end of period (in shares)	6,181	5,521	4,939
Expected to vest (in shares)	4,859
Weighted-Average Grant Date Fair Value
RSUs Outstanding, beginning of period (in dollars per share)	$ 11	$ 11	$ 10
Vested (in dollars per share)	11	10	10
Cancelled or expired (in dollars per share)	14	12	11
RSUs Outstanding, end of period (in dollars per share)	14	$ 11	$ 11
Expected to vest (in dollars per share)	$ 14
Weighted-Average Remaining Vesting Period
Outstanding, March 31, 2017	1 year 2 months 12 days
Expected to vest, March 31, 2017	1 year 2 months 12 days
Aggregate Fair Value
Vested	$ 48,644	$ 22,823	$ 27,844
Outstanding, March 31, 2017	196,983
Expected to vest, March 31, 2017	$ 154,846
Time-based RSUs
Number of Shares
Granted (in shares)	2,390	2,247	1,332
Weighted-Average Grant Date Fair Value
Granted (in dollars per share)	$ 16	$ 13	$ 13
Market Based RSUs
Number of Shares
Granted (in shares)	160	356	523
Weighted-Average Grant Date Fair Value
Granted (in dollars per share)	$ 15	$ 14	$ 13
Performance-based RSUs
Number of Shares
Granted (in shares)	604	356	55
Weighted-Average Grant Date Fair Value
Granted (in dollars per share)	$ 15	$ 13	$ 12

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested and Expected to Vest

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Expected to Vest, Weighted Average Remaining Contractual Terms

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

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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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-Publisher FASB
-Name Accounting Standards Codification
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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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-Name Accounting Standards Codification
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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 equity-based compensation awards outstanding. Excludes stock and unit options.

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Intrinsic value of equity-based compensation awards vested. Excludes stock and unit options.

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