STOCKHOLDERS' EQUITY: - Summary of Options (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Stock options outstanding and exercisable by exercise price range
Options outstanding (in shares)	3,604,102
Options outstanding - Weighted-average remaining contractual life	5 years 2 months 12 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 14.52
Options exercisable (in shares)	2,486,647
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 14.62
Stock options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Share-based compensation expense	$ 9.8	$ 12.0	$ 2.2
Range of exercise price per share from $0.63 to $8.90
Stock options outstanding and exercisable by exercise price range
Exercise price per share, low end of range (in dollars per share)	$ 0.63
Exercise price per share, high end of range (in dollars per share)	$ 8.90
Options outstanding (in shares)	690,255
Options outstanding - Weighted-average remaining contractual life	6 years 9 months 29 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 1.80
Options exercisable (in shares)	387,703
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 1.82
Range of exercise price per share from $11.08 to $14.21
Stock options outstanding and exercisable by exercise price range
Exercise price per share, low end of range (in dollars per share)	11.08
Exercise price per share, high end of range (in dollars per share)	$ 14.21
Options outstanding (in shares)	1,052,358
Options outstanding - Weighted-average remaining contractual life	4 years 7 months 28 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 13.32
Options exercisable (in shares)	985,021
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 13.32
Range of exercise price per share from $15.31 to $19.76
Stock options outstanding and exercisable by exercise price range
Exercise price per share, low end of range (in dollars per share)	15.31
Exercise price per share, high end of range (in dollars per share)	$ 19.76
Options outstanding (in shares)	819,902
Options outstanding - Weighted-average remaining contractual life	5 years 6 months 15 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 17.16
Options exercisable (in shares)	404,855
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 16.54
Range of exercise price per share from $20.27 to $24.53
Stock options outstanding and exercisable by exercise price range
Exercise price per share, low end of range (in dollars per share)	20.27
Exercise price per share, high end of range (in dollars per share)	$ 24.53
Options outstanding (in shares)	1,021,945
Options outstanding - Weighted-average remaining contractual life	4 years 4 months 6 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 21.87
Options exercisable (in shares)	699,204
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 22.18
Range of exercise price per share from $27.77 to $32.85
Stock options outstanding and exercisable by exercise price range
Exercise price per share, low end of range (in dollars per share)	27.77
Exercise price per share, high end of range (in dollars per share)	$ 32.85
Options outstanding (in shares)	19,642
Options outstanding - Weighted-average remaining contractual life	7 years 6 months 29 days
Options outstanding - Weighted-average exercise price per share (in dollars per share)	$ 32.83
Options exercisable (in shares)	9,864
Options exercisable - Weighted-average exercise price per share (in dollars per share)	$ 32.80
LiveRamp Employees | Stock options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Share-based compensation expense	$ 6.7	$ 9.4