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Share-Based Compensation - Summary of Share-based Compensation Activity (Details)	3 Months Ended
	Jun. 30, 2018 shares
Options
Number of Options
Outstanding at beginning of period (in shares)	3,796,620
Granted (in shares)	224,582
Exercised (in shares)	(619,465)
Canceled/forfeited (in shares)	(4,600)
Outstanding at end of period (in shares)	3,397,137
Restricted Shares
Number of Unvested Restricted Shares
Unvested at beginning of period (in shares)	64,148
Granted (in shares)	0
Vested (in shares)	(52,786)
Decrease due to performance condition (in shares)	0
Canceled/forfeited (in shares)	(344)
Unvested at end of period (in shares)	11,018
Service-Based RSUs
Number of Unvested Restricted Shares
Unvested at beginning of period (in shares)	2,127,517
Granted (in shares)	757,231
Vested (in shares)	(493,541)
Decrease due to performance condition (in shares)	0
Canceled/forfeited (in shares)	(45,437)
Unvested at end of period (in shares)	2,345,770
Performance-Based RSUs
Number of Unvested Restricted Shares
Unvested at beginning of period (in shares)	657,532
Granted (in shares)	166,617
Vested (in shares)	(105,900)
Decrease due to performance condition (in shares)	(101,744)
Canceled/forfeited (in shares)	(3,397)
Unvested at end of period (in shares)	613,108

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Achievement of Performance Condition

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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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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 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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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Number of share options (or share units) exercised during the current period.

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