Share Based Awards - Summary of Stock Options By Grant Date (Details) - $ / shares	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercise Price Granted (in USD per share)	$ 16.40	$ 14.56	$ 11.30
2015 Plan | Employee Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares granted	326,130	1,479,000	1,146,500
2015 Plan | Employee Stock Options | January 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares granted			90,000
Exercise Price Granted (in USD per share)			$ 15.01
Vesting period			4 years
Expiration			Jan. 31, 2025
2015 Plan | Employee Stock Options | November 1, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares granted			50,000
Exercise Price Granted (in USD per share)			$ 12.71
Vesting period			4 years
Expiration			Nov. 01, 2024
2015 Plan | Employee Stock Options | July 11, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares granted			150,000
Exercise Price Granted (in USD per share)			$ 12.60
Vesting period			4 years
Expiration			Jul. 11, 2024
2015 Plan | Employee Stock Options | May 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares granted			100,000
Exercise Price Granted (in USD per share)			$ 12.71
Vesting period			5 years
Expiration			May 31, 2024
2015 Plan | Employee Stock Options | May 25, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares granted			216,500
Exercise Price Granted (in USD per share)			$ 12.78
Vesting period			4 years
Expiration			May 25, 2024
2015 Plan | Employee Stock Options | May 24, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares granted			540,000
Exercise Price Granted (in USD per share)			$ 12.93
Vesting period			4 years
Expiration			May 24, 2024
2015 Plan | Employee Stock Options | June 13, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares granted		249,000
Exercise Price Granted (in USD per share)		$ 16.37
Vesting period		4 years
Expiration		Jun. 13, 2025
2015 Plan | Employee Stock Options | May 24, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares granted		60,000
Exercise Price Granted (in USD per share)		$ 14.57
Vesting period		4 years
Expiration		May 24, 2025
2015 Plan | Employee Stock Options | August 4, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares granted		25,000
Exercise Price Granted (in USD per share)		$ 16.13
Vesting period		4 years
Expiration		Aug. 04, 2025
2015 Plan | Employee Stock Options | October 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares granted		915,000
Exercise Price Granted (in USD per share)		$ 14.07
Vesting period		4 years
Expiration		Oct. 31, 2025
2015 Plan | Employee Stock Options | December 4, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares granted		230,000
Exercise Price Granted (in USD per share)		$ 14.38
Vesting period		4 years
Expiration		Dec. 04, 2025
2015 Plan | Employee Stock Options | May 30, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares granted	241,130
Exercise Price Granted (in USD per share)	$ 16.83
Vesting period	4 years
Expiration	Jun. 01, 2026
2015 Plan | Employee Stock Options | August 3, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares granted	60,000
Exercise Price Granted (in USD per share)	$ 21.27
Vesting period	4 years
Expiration	Aug. 03, 2026
2015 Plan | Employee Stock Options | November 2, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares granted	25,000
Exercise Price Granted (in USD per share)	$ 15.09
Vesting period	4 years
Expiration	Nov. 02, 2026