Organization and Significant Accounting Policies Organization and Significant Accounting Polices - Contract Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Accounting Policies [Abstract]
Contract with Customer, Liability, Revenue Recognized	$ 900	$ 300	$ 200
Contract with Customer, Liability, Current	256	256
Contract with Customer, Liability, Noncurrent	0	513
Contract with Customer, Liability	$ 256	$ 769