DEFERRED DRYDOCK COSTS, NET (Balance Sheet Details) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Mar. 31, 2017	Mar. 31, 2016
Deferred Drydock Costs [Abstract]
Deferred expenditures	$ 18,929	$ 19,395
Accumulated amortization	(6,712)	(10,593)
Deferred drydock costs, net	$ 12,217	$ 8,802	$ 6,660