PROPERTY AND EQUIPMENT: (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Property and Equipment
Property and equipment, gross	$ 64,852	$ 62,353
Less accumulated depreciation and amortization	38,809	30,013
Property and equipment, net	26,043	32,340
Depreciation expense on property and equipment	15,600	11,800	$ 11,200
Accelerated depreciation	3,800
Leasehold improvements
Property and Equipment
Property and equipment, gross	20,097	15,635
Data processing equipment
Property and Equipment
Property and equipment, gross	37,678	39,938
Office furniture and other equipment
Property and Equipment
Property and equipment, gross	$ 7,077	$ 6,780

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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