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Stock Acquisition Rights, Stock Options and Warrants (Schedule of Additional Information Regarding Stock Options Outstanding) (Details) - Stock Option [Member]
12 Months Ended
Mar. 31, 2019
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number Outstanding | shares 1,923,634
Weighted Average Remaining Life in Years 5 years 10 months 6 days
Weighted Average Exercise Price $ 23.64
Options Exercisable | shares 1,543,003
Weighted Average Exercise Price of Shares Exercisable $ 22.70
$13.25 - $20.00 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise Prices, Minimum 13.25
Exercise Prices, Maximum $ 20.00
Number Outstanding | shares 973,698
Weighted Average Remaining Life in Years 4 years 6 months
Weighted Average Exercise Price $ 19.82
Options Exercisable | shares 973,698
Weighted Average Exercise Price of Shares Exercisable $ 19.82
$20.01 - $46.23 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise Prices, Minimum 20.01
Exercise Prices, Maximum $ 46.23
Number Outstanding | shares 919,936
Weighted Average Remaining Life in Years 7 years 3 months 11 days
Weighted Average Exercise Price $ 26.85
Options Exercisable | shares 543,805
Weighted Average Exercise Price of Shares Exercisable $ 26.61
$46.24 - $72.85 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise Prices, Minimum 46.24
Exercise Prices, Maximum $ 72.85
Number Outstanding | shares 30,000
Weighted Average Remaining Life in Years 5 years 10 months 13 days
Weighted Average Exercise Price $ 49.14
Options Exercisable | shares 25,500
Weighted Average Exercise Price of Shares Exercisable $ 49.14