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STOCK-BASED COMPENSATION: (Tables)
9 Months Ended
Dec. 31, 2020
Equity [Abstract]  
Schedule of stock-based compensation activity, by award type
The Company's stock-based compensation activity for the nine months ended December 31, 2020, by award type, was (dollars in millions):
For the nine months ended
December 31,
20202019
Stock options$1.9 $2.8 
Restricted stock units40.5 40.5 
Arbor acquisition consideration holdback— 2.6 
DPM acquisition consideration holdback6.0 4.1 
PDP assumed performance plan13.8 21.4 
Acuity performance plan1.4 — 
Other stock-based compensation1.0 0.9 
Total non-cash stock-based compensation included in the condensed consolidated statements of operations64.6 72.3 
Less expense related to liability-based equity awards(19.7)(23.3)
Total non-cash stock-based compensation included in the condensed consolidated statements of equity$44.9 $49.0 
Schedule of effect of stock-based compensation expense on income, by financial statement line item
The effect of stock-based compensation expense on income, by financial statement line item, was (dollars in millions):
For the nine months ended
December 31,
20202019
Cost of revenue$2.7 $2.8 
Research and development21.0 17.3 
Sales and marketing25.6 34.4 
General and administrative15.3 17.8 
Total non-cash stock-based compensation included in the condensed consolidated statements of operations$64.6 $72.3 
Schedule of share based compensation arrangement by share based payment award, future expense
The following table provides the expected future expense for all of the Company's outstanding equity awards at December 31, 2020, by award type. The amount for 2021 represents the remaining three months ending March 31, 2021. All other periods represent fiscal years ending March 31 (dollars in millions).

For the years ending March 31,
20212022202320242025Total
Stock options$0.3 $1.1 $0.3 $— $— $1.7 
Restricted stock units59.4 42.9 43.9 24.1 4.4 174.7 
DPM acquisition consideration holdback2.0 8.1 2.1 — — 12.2 
PDP assumed performance plan4.6 9.2 — — — 13.8 
Acuity performance plan0.8 1.9 0.8 0.2 — 3.7 
Other stock-based compensation0.6 0.4 — — — 1.0 
$67.7 $63.6 $47.1 $24.3 $4.4 $207.1 
Schedule of option activity
Stock option activity for the nine months ended December 31, 2020 was: 
Weighted-average
Weighted-averageremainingAggregate
Number ofexercise pricecontractual termIntrinsic value
sharesper share(in years)(in thousands)
Outstanding at March 31, 20201,350,658 $14.43 
Exercised(524,085)$12.37 $22,271 
Forfeited or canceled(6,124)$5.24 
Outstanding at December 31, 2020820,449 $15.81 3.4$47,075 
Exercisable at December 31, 2020783,303 $16.47 3.2$44,431 
Summary of stock options outstanding and exercisable
A summary of stock options outstanding and exercisable as of December 31, 2020 was:

Options outstandingOptions exercisable
Range ofWeighted-averageWeighted-averageWeighted-average
exercise priceOptionsremainingexercise priceOptionsexercise price
per shareoutstandingcontractual lifeper shareexercisableper share
$0.61 $9.99 125,984 4.6 years$1.52 88,838 $1.32 
$10.00 $19.99 346,807 3.0 years$15.50 346,807 $15.50 
$20.00 $24.99 347,658 3.3 years$21.31 347,658 $21.31 
820,449 3.4 years$15.81 783,303 $16.47 
Schedule of time-vesting restricted stock unit activity
RSU activity for the nine months ended December 31, 2020 was:
Weighted-average
fair value perWeighted-average
Numbershare at grantremaining contractual
of sharesdateterm (in years)
Outstanding at March 31, 20203,351,638 $40.68 2.51
Granted1,969,500 $41.36 
Vested(1,011,380)$41.43 
Forfeited or canceled(459,731)$41.35 
Outstanding at December 31, 20203,850,027 $40.75 2.57
Schedule of non-vested performance-based restricted stock units activity
PSU activity for the nine months ended December 31, 2020 was:
Weighted-average
fair value perWeighted-average
Numbershare at grantremaining contractual
of sharesdateterm (in years)
Outstanding at March 31, 2020545,446 $51.01 2.24
Granted246,524 $43.40 
Additional earned performance shares38,063 $55.48 
Vested(121,587)$48.88 
Forfeited or canceled(34,731)$34.94 
Outstanding at December 31, 2020673,715 $49.69 1.78