SIGNIFICANT ACCOUNTING POLICIES (Details)	6 Months Ended
	Sep. 30, 2017
Significant Accounting Policies [Line Items]
Amortization period of drydock costs	60 months
Purchased Software
Significant Accounting Policies [Line Items]
Useful life	3 years
Vehicles
Significant Accounting Policies [Line Items]
Depreciation rate	20.00%
Furniture and equipment
Significant Accounting Policies [Line Items]
Depreciation rate	20.00%
Computer equipment
Significant Accounting Policies [Line Items]
Depreciation rate	45.00%
Communication equipment
Significant Accounting Policies [Line Items]
Depreciation rate	20.00%
Customer relationships and contracts
Significant Accounting Policies [Line Items]
Amortization period	15 years
Minimum
Significant Accounting Policies [Line Items]
Age of receivables	30 days
Minimum | Vessels
Significant Accounting Policies [Line Items]
Useful life	5 years
Minimum | Leasehold improvements
Significant Accounting Policies [Line Items]
Useful life	7 years
Maximum
Significant Accounting Policies [Line Items]
Age of receivables	60 days
Freight surcharges as a percent of revenue	5.00%
Maximum | Vessels
Significant Accounting Policies [Line Items]
Useful life	30 years
Maximum | Leasehold improvements
Significant Accounting Policies [Line Items]
Useful life	11 years