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Debt and Credit Facility Convertible Debt (Details)
6 Months Ended
Sep. 30, 2017
$ / shares
2017 Senior Subordinated Convertible Debt  
Debt Instrument, Redemption [Line Items]  
Conversion Rate, adjusted 10.0322
Approximate Conversion Price, adjusted $ 99.68
Maximum Incremental Rate, adjusted 5.0161
Maximum Conversion Rate, adjusted 14.2959
2015 Senior Subordinated Convertible Debt  
Debt Instrument, Redemption [Line Items]  
Conversion Rate, adjusted 15.6445
Approximate Conversion Price, adjusted $ 63.92
Maximum Incremental Rate, adjusted 7.8223
Maximum Conversion Rate, adjusted 21.9023
2017 Junior Subordinated Convertible Debt  
Debt Instrument, Redemption [Line Items]  
Conversion Rate, adjusted 10.2114
Approximate Conversion Price, adjusted $ 97.93
Maximum Incremental Rate, adjusted 5.1057
Maximum Conversion Rate, adjusted 14.2959
2007 Junior Subordinated Convertible Debt  
Debt Instrument, Redemption [Line Items]  
Conversion Rate, adjusted 42.5069
Approximate Conversion Price, adjusted $ 23.53
Maximum Conversion Rate, adjusted 48.8829