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STOCKHOLDERS' EQUITY: - Other Performance (Details) - USD ($) $ / shares in Units, $ in Thousands	2 Months Ended	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2019	Mar. 31, 2018
Share-based Activity - Other disclosures
Stock-based compensation of discontinued operations		$ 62,800	$ 10,300	$ 9,700
Holdback consideration transferred			$ 38,300
Business Acquisition, equity interest issued or issuable, number of shares (in shares)		382,462	578,071	184,214
Non-cash stock-based compensation expense		$ 102,722	$ 52,867	$ 39,408
Other accrued expenses					$ 40,916	$ 39,624
Other Performance Units
Share-based compensation activity
Outstanding at the beginning of the period (in shares)		111,111
Vested (in shares)		(45,364)
Forfeited or cancelled (in shares)		(65,747)
Outstanding at the end of the period (in shares)	111,111	0	111,111
Share-based compensation, Weighted average fair value per share at grant date
Outstanding at the beginning of the period (in dollars per share)		$ 5.33
Vested (in dollars per share)		5.33
Forfeited or cancelled (in dollars per share)		5.33
Outstanding at the end of the period (in dollars per share)	$ 5.33	$ 0	$ 5.33
Weighted-average remaining contractual term
Weighted-average remaining contractual term (in years)		0 years	0 years
Share-based Activity - Other disclosures
Vested (in shares)		45,364
Outstanding (in shares)	111,111	0	111,111		0	111,111
Forfeited or cancelled (in shares)		65,747
Other Performance Units | Vesting based on relevant performance period at March 31 2017
Share-based Activity - Other disclosures
Share-based compensation arrangement by share-based payment award, non-option equity instruments, percentage reduction in vested shares		59.00%
Time-Vesting Restricted Stock Units
Share-based Activity - Other disclosures
Granted (in shares)		1,187,344
Accelerated compensation costs		$ 54,000
Incremental compensation cost		27,000
Accelerated original grant date fair value compensation cost		$ 27,000
Conversion percentage		200.00%
Restricted stock units | Vesting Based on Relevant Performance Period at March 31 2019
Share-based compensation activity
Vested (in shares)		(23,142)
Forfeited or cancelled (in shares)		(17,562)
Outstanding at the end of the period (in shares)		46,289
Share-based Activity - Other disclosures
Vesting percentage		53.30%
Vested (in shares)		23,142
Outstanding (in shares)		46,289			46,289
Forfeited or cancelled (in shares)		17,562
Restricted stock units | Vesting Based On Maturity Of The Relevant Performance Period at March 31 2019
Share-based Activity - Other disclosures
Vesting percentage		0.00%
Restricted stock units | Performance Stock
Share-based compensation activity
Outstanding at the beginning of the period (in shares)		557,801
Vested (in shares)		(61,330)
Forfeited or cancelled (in shares)		(133,017)
Outstanding at the end of the period (in shares)	557,801	394,188	557,801
Share-based compensation, Weighted average fair value per share at grant date
Outstanding at the beginning of the period (in dollars per share)		$ 25.65
Vested (in dollars per share)		24.22
Forfeited or cancelled (in dollars per share)		25.16
Outstanding at the end of the period (in dollars per share)	$ 25.65	$ 43.88	$ 25.65
Weighted-average remaining contractual term
Weighted-average remaining contractual term (in years)		3 years 2 months 23 days	1 year 8 months 1 day
Share-based Activity - Other disclosures
Granted (in shares)		534,438	389,065
Vested (in shares)		61,330
Outstanding (in shares)	557,801	557,801	557,801		394,188	557,801
Forfeited or cancelled (in shares)		133,017
Vested in period, total fair value		$ 2,200	$ 14,100
Pacific Data Partners LLC
Share-based Activity - Other disclosures
Non-cash stock-based compensation expense	$ 17,800
Other accrued expenses					$ 16,000

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