Supplemental Information (Details Textual) - USD ($)	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Supplemental Cash Flow Elements [Abstract]
Capital expenditures incurred but not yet paid	$ 42,000,000
Capital lease obligations incurred (less than)	$ 0	$ 1,000,000	$ 1,000,000