EARNINGS (LOSS) PER SHARE AND STOCKHOLDERS’ EQUITY: Narrative (Details) - USD ($) shares in Millions	9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2019	Oct. 25, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Repurchase of stock (in shares)	2.6
Acquisition of treasury stock	$ 121,188,000	$ 64,107,000
Treasury stock, at cost	1,906,819,000		$ 1,767,574,000
Accumulated other comprehensive income	$ 6,776,000		$ 7,801,000
Common Stock Repurchase Program
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock repurchase program, authorized amount				$ 1,000,000,000.0
Repurchase of stock (in shares)	25.1
Treasury stock, at cost	$ 570,200,000
Stock repurchase program, remaining amount	$ 429,800,000