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STOCK-BASED COMPENSATION: (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 6 Months Ended |
--- | --- | --- | ---
Jul. 02, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2019
Share-based compensation |  |  |  |
Exercised (in dollars per share) |  | $ 3.55 |  |
Stock Option Activity - Number of Shares |  |  |  |
Outstanding at beginning of the period (in shares) |  | 1,374,430 |  |
Exercised (in shares) |  | (77,209) |  |
Forfeited or cancelled (in shares) |  | (4,354) |  |
Outstanding at end of the period (in shares) |  | 1,455,348 |  |
Exercisable at the end of the period (in shares) |  | 1,301,861 |  |
Weighted-average exercise price per share |  |  |  |
Outstanding at the beginning of the period (in dollars per share) |  | $ 14.81 |  |
Exercised (in dollars per share) |  | 3.55 |  |
Forfeited or cancelled (in dollars per share) |  | 5.39 |  |
Outstanding at the end of the period (in dollars per share) |  | 13.97 |  |
Exercisable at the end of the period (in dollars per share) |  | $ 15.41 |  |
Weighted-average remaining contractual term |  |  |  |
Weighted average remaining contractual term |  | 4 years 3 months 18 days |  |
Exercisable at the end of the period |  | 3 years 10 months 24 days |  |
Aggregate intrinsic value |  |  |  |
Exercised |  | $ 3,343 |  |
Outstanding at the end of the period |  | 42,197 |  |
Exercisable at the end of the period |  | $ 35,877 |  |
Data Plus Math Corporation |  |  |  |
Share-based compensation |  |  |  |
Fair value of replacement stock options considered a component of purchase price | $ 2,300 |  |  |
Expected dividend yield |  | 0.00% |  |
Risk free interest rate, minimum |  | 1.86% |  |
Risk free interest rate, maximum |  | 1.96% |  |
Expected volatility rate |  | 45.00% |  |
Number of option fully vested (in shares) |  | 48,619 |  |
Data Plus Math Corporation | Minimum |  |  |  |
Share-based compensation |  |  |  |
Expected term |  | 7 years 3 months 29 days |  |
Data Plus Math Corporation | Maximum |  |  |  |
Share-based compensation |  |  |  |
Expected term |  | 9 years 6 months 18 days |  |
Stock options |  |  |  |
Share-based compensation |  |  |  |
Share-based compensation expense |  | $ 1,800 | $ 1,700 |
Stock options | Data Plus Math Corporation |  |  |  |
Share-based compensation |  |  |  |
Shares issued in period (in shares) |  | 162,481 |  |
Exercised (in dollars per share) |  | $ 1.64 |  |
Weighted-average exercise price per share |  |  |  |
Exercised (in dollars per share) |  | $ 1.64 |  |
Stock Option and Equity Compensation Plans |  |  |  |
Share-based compensation |  |  |  |
Total shares reserved for issuance since inception of the stock option and equity compensation plans (in shares) |  |  |  | 42,300,000
Shares which remained available for future grants (in shares) |  | 10,400,000 |  |

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