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Debt and Credit Facility - Convertible Debt (Details)	6 Months Ended
	Sep. 30, 2018 $ / shares
2017 Senior Convertible Debt
Debt Instrument, Redemption [Line Items]
Conversion Rate, adjusted	10.2005
Approximate conversion price, adjusted (in usd per share)	$ 98.03
Incremental Share Factor, adjusted	5.1002
Maximum Conversion Rate, adjusted	14.5357
2015 Senior Convertible Debt
Debt Instrument, Redemption [Line Items]
Conversion Rate, adjusted	15.9069
Approximate conversion price, adjusted (in usd per share)	$ 62.87
Incremental Share Factor, adjusted	7.9535
Maximum Conversion Rate, adjusted	22.2697
2017 Junior Convertible Debt
Debt Instrument, Redemption [Line Items]
Conversion Rate, adjusted	10.3827
Approximate conversion price, adjusted (in usd per share)	$ 96.31
Incremental Share Factor, adjusted	5.1914
Maximum Conversion Rate, adjusted	14.5357

X

- Definition

The amount of shares of common stock that will be added to the conversion ratio if at the time of conversion the applicable stock price of the Company's common stock exceeds the base conversion price, adjusted for dividends paid since the issuance date.

+ References

No definition available.

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- Definition

Debt Instrument, Convertible, Conversion Ratio Maximum Conversion Rate, Adjusted for Paid Dividends

+ References

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- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870

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- Definition

Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(5))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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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