Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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-Section 50
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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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LEASES: Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
LEASES: Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease costs	$ 11,600	$ 10,100
Operating leases, rent expense prior to the adoption of Topic 842 lease guidance			$ 12,800
Fiscal 2022	9,960
Fiscal 2023	3,304
Fiscal 2024	1,198
Fiscal 2025	69
Leased office facilities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Fiscal 2022	2,611
Fiscal 2023	2,663
Fiscal 2024	2,698
Fiscal 2025	2,698
Fiscal 2026	$ 1,799