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Debt and Credit Facility - Convertible Debt (Details)
12 Months Ended
Mar. 31, 2019
$ / shares
2017 Senior Convertible Debt  
Debt Instrument [Line Items]  
Conversion rate, adjusted 10.2925
Approximate conversion price, adjusted $ 97.16
Incremental share factor, adjusted 5.1462
Maximum conversion rate, adjusted 14.6668
2015 Senior Convertible Debt  
Debt Instrument [Line Items]  
Conversion rate, adjusted 16.0504
Approximate conversion price, adjusted $ 62.30
Incremental share factor, adjusted 8.0252
Maximum conversion rate, adjusted 22.4705
2017 Junior Convertible Debt  
Debt Instrument [Line Items]  
Conversion rate, adjusted 10.4763
Approximate conversion price, adjusted $ 95.45
Incremental share factor, adjusted 5.2382
Maximum conversion rate, adjusted 14.6668