LEASES: Lease Cost (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Mar. 31, 2022
Leases [Abstract]
Right-of-use assets included in other assets, net	$ 40,359	$ 59,459
Operating lease, right-of-use asset, statement of financial position [Extensible Enumeration]	Other assets, net	Other assets, net
Short-term lease liabilities included in other accrued expenses	$ 10,256	$ 8,984
Operating lease, liability, current, statement of financial position [Extensible Enumeration]	Other Accrued Liabilities, Current	Other Accrued Liabilities, Current
Long-term lease liabilities included in other liabilities	$ 40,660	$ 52,241
Operating lease, liability, noncurrent, statement of financial position [Extensible Enumeration]	Other liabilities	Other liabilities
Weighted average remaining lease term	6 years	6 years 4 months 24 days
Weighted average discount rate	3.50%	3.60%