Share-Based Compensation - Additional Information (Details) $ / shares in Units, $ in Millions	6 Months Ended
Sep. 30, 2017 USD ($) equity_plan $ / shares shares	Oct. 01, 2016 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity plans \| equity_plan	2
Weighted average grant date fair value of option (in dollars per share) \| $ / shares	$ 11.59	$ 13.79
Estimated value of future forfeitures \| $	$ 8.7
Service-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value of RSUs (in dollar per share) \| $ / shares	$ 34.94	50.24
Performance-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value of RSUs (in dollar per share) \| $ / shares	$ 34.68	$ 49.88
2008 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity plans adopted \| equity_plan	1
Shares authorized for issuance (up to) (in shares)	23,980,823
Shares available for grant (in shares)	0
Option expiration period (years)	10 years
Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance (up to) (in shares)	15,246,000
Shares available for grant (in shares)	7,447,720
Option expiration period (years)	7 years

Share Based Compensation Arrangement By Share Based Payment Award Number Of Equity Incentive Plans

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Number of Plans Adopted

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No definition available.

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- Definition

Stock-based compensation expense, estimated expected forfeitures

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No definition available.

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- Definition

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).

+ 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)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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.

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ 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 (a)(3)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ 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 (d)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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 (a)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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