Software Development Costs (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Mar. 31, 2016
Other Long-Term Assets
Software costs capitalized during the period	$ 3.9	$ 1.1
Total capitalized software cost	1.7		$ 1.7
Accumulated software cost amortization	0.4		0.0
Property and Equipment
Software costs capitalized during the period	0.7	$ 0.2
Total capitalized software cost	2.5		1.2
Accumulated software cost amortization	$ 0.6		$ 0.2