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Employee Benefit Plans (Unamortized Share-Based Compensation Expense) (Details) $ in Thousands	12 Months Ended
	Mar. 31, 2018 USD ($)
Employee Benefit Plan
Unamortized Expense	$ 71,680
ESPP
Employee Benefit Plan
Unamortized Expense	$ 1,337
Remaining Months	4 months
Time-based RSUs
Employee Benefit Plan
Unamortized Expense	$ 56,723
Remaining Months	21 months
Market-based and performance-based RSUs
Employee Benefit Plan
Unamortized Expense	$ 13,620
Remaining Months	23 months

X

- Definition

Unrecognized cost of unvested share-based compensation awards.

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

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X

- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 (i)
-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.

+ References

No definition available.

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- Details

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X

- Details

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