LEASES: Lease Cost (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Right-of-use asset (see Note 3)	$ 11,731	$ 17,830
Operating lease, right-of-use asset, statement of financial position [Extensible List]	Other assets, net	Other assets, net
Short-term lease liabilities (see Note 3)	$ 9,608	$ 9,641
Operating lease, liability, current, statement of financial position [Extensible List]	us-gaap:OtherAccruedLiabilitiesCurrent	us-gaap:OtherAccruedLiabilitiesCurrent
Long-term lease liabilities	$ 4,158	$ 11,449
Operating lease, liability, noncurrent, statement of financial position [Extensible List]	Other liabilities	Other liabilities