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Stock-based Compensation (Narrative) (Details) $ in Millions	6 Months Ended
	Sep. 30, 2016 USD ($)
Stock-Based Awards
Unamortized stock-based compensation expense related to unvested stock awards	$ 52.6
Weighted average period of recognition for unrecognized compensation costs (in years)	2 years 94 days
Acquisition-related
Unamortized stock-based compensation expense related to unvested stock awards	$ 1.6
Weighted average period of recognition for unrecognized compensation costs (in years)	2 years 241 days
Employee Stock Purchase Plan
Unamortized stock-based compensation expense related to unvested stock awards	$ 0.5
Weighted average period of recognition for unrecognized compensation costs (in years)	180 days

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=6415400&loc=d3e5070-113901

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- 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=6415400&loc=d3e5070-113901

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