Income Taxes - Loss Before Income Taxes and Related Tax Benefit (Details) - USD ($) $ in Thousands	2 Months Ended	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2017
Loss before income taxes:
Bermuda	$ (1,657)	$ (50,845)
Total loss before income taxes	(1,657)	(83,514)
Current taxes:
Bermuda	0	0
Total current tax expense	0	134
Deferred taxes:
Bermuda	0	0
Total deferred tax benefit	0	(208)
Total income tax benefit	0	(74)
United States
Loss before income taxes:
Foreign	0	(2,924)
Current taxes:
Foreign	0	134
Deferred taxes:
Foreign	0	(208)
Switzerland
Loss before income taxes:
Foreign	0	(29,745)
Current taxes:
Foreign	0	0
Deferred taxes:
Foreign	$ 0	$ 0