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STOCK-BASED COMPENSATION: Other (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 USD ($) numberOfExerciseMultiple | Jun. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) numberOfExerciseMultiple shares | Sep. 30, 2018 USD ($) | Mar. 31, 2019 USD ($)
Share-based compensation |  |  |  |  |  |  |
Non-cash stock-based compensation | $ 16,268 | $ 15,064 | $ 17,281 | $ 16,811 | $ 31,300 | $ 34,100 |
Payments related to tax withholding for share-based compensation |  |  |  |  | 13,907 | 14,624 |
Share-based Activity - Other disclosures |  |  |  |  |  |  |
Non-cash stock compensation expense |  |  |  |  | 41,984 | 35,465 |
Other accrued expenses | 55,724 |  |  |  | 55,724 |  | $ 40,916
Holdback expenses |  |  |  |  | $ 38,300 |  |
Common Stock |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Non-cash stock-based compensation | $ 1 | $ 5 | $ 9 | $ 15 |  |  |
Consideration Holdback |  |  |  |  |  |  |
Share-based Activity - Other disclosures |  |  |  |  |  |  |
Contingent consideration arrangements, number of annual increments | numberOfExerciseMultiple | 3 |  |  |  | 3 |  |
Data Plus Math Corporation |  |  |  |  |  |  |
Share-based Activity - Other disclosures |  |  |  |  |  |  |
Holdback consideration transferred |  |  |  |  | $ 24,700 |  |
Holdback expenses |  |  |  |  | 2,100 |  |
Arbor |  |  |  |  |  |  |
Share-based Activity - Other disclosures |  |  |  |  |  |  |
Holdback consideration transferred |  |  |  |  | 38,300 |  |
Arbor | Arbor Holdback Agreement |  |  |  |  |  |  |
Share-based Activity - Other disclosures |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | 2,600 | $ 7,700 |
Pacific Data Partners LLC |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions, Expenses and Losses Recognized |  |  |  |  | 27,200 |  |
Share-based Activity - Other disclosures |  |  |  |  |  |  |
Other accrued expenses | $ 6,800 |  |  |  | 6,800 |  |
Pacific Data Partners LLC | Common Stock |  |  |  |  |  |  |
Share-based Activity - Other disclosures |  |  |  |  |  |  |
Performance payout |  |  |  |  | $ 19,700 |  |
Deferred compensation arrangement, shares issued (in shares) | shares |  |  |  |  | 465,389 |  |
Deferred compensation arrangement, liability-classified portion, shares issued (in shares) | shares |  |  |  |  | 418,850 |  |

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