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Debt and Credit Facility - Convertible Debt (Details)
9 Months Ended
Dec. 31, 2018
$ / shares
2017 Senior Convertible Debt  
Debt Instrument, Redemption [Line Items]  
Conversion Rate, adjusted 10.2510
Approximate conversion price, adjusted (in usd per share) $ 97.55
Incremental Share Factor, adjusted 5.1255
Maximum Conversion Rate, adjusted 14.6078
2015 Senior Convertible Debt  
Debt Instrument, Redemption [Line Items]  
Conversion Rate, adjusted 15.9858
Approximate conversion price, adjusted (in usd per share) $ 62.56
Incremental Share Factor, adjusted 7.9929
Maximum Conversion Rate, adjusted 22.3801
2017 Junior Convertible Debt  
Debt Instrument, Redemption [Line Items]  
Conversion Rate, adjusted 10.4341
Approximate conversion price, adjusted (in usd per share) $ 95.84
Incremental Share Factor, adjusted 5.2171
Maximum Conversion Rate, adjusted 14.6078