LOSS PER SHARE AND STOCKHOLDERS’ EQUITY: Narrative (Details) - USD ($) shares in Thousands	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2019	Oct. 25, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	431	119
Repurchase of stock (in shares)	400
Acquisition of treasury stock	$ 20,099,000	$ 45,766,000
Treasury stock, at cost	1,799,766,000		$ 1,767,574,000
Accumulated other comprehensive income	$ 7,334,000		$ 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)	23,000
Treasury stock, at cost	$ 469,200,000
Stock repurchase program, remaining amount	$ 530,800,000
Stock Options And Warrants And Restricted Stock Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	2,800	2,300