STOCK-BASED COMPENSATION: - Performance-based restricted stock units (Details) - Restricted stock units $ in Millions	3 Months Ended
Jun. 30, 2020 USD ($) shares
Performance stock
Share-based compensation
Granted (in shares)	246,524
Aggregate fair value of restricted stock units granted \| $	$ 10.7
Vesting in period (in shares)	32,514
Forfeited in period (in shares)	28,857
The total fair value of performance-based restricted stock units \| $	$ 1.2
Performance Shares Vesting Total Shareholder Return
Share-based compensation
Granted (in shares)	73,950
Aggregate fair value of restricted stock units granted \| $	$ 4.2
Performance Shares Vesting Total Shareholder Return \| Minimum
Share-based compensation
Award vesting rights percentage	0.00%
Performance Shares Vesting Total Shareholder Return \| Maximum
Share-based compensation
Award vesting rights percentage	200.00%
Performance Shares Vesting Under The Second Plan
Share-based compensation
Granted (in shares)	172,574
Aggregate fair value of restricted stock units granted \| $	$ 6.5
Award vesting rights percentage	50.00%
Performance Shares Vesting Under The Second Plan \| Minimum
Share-based compensation
Award vesting rights percentage	0.00%
Performance Shares Vesting Under The Second Plan \| Maximum
Share-based compensation
Award vesting rights percentage	200.00%
Performance Shares Vesting In Three Equal Annual Increments
Share-based compensation
Vesting in period (in shares)	59,480
Forfeited in period (in shares)	38,063
Vesting Based on Relevant Performance Period Over Two Periods at March 31 2020
Share-based compensation
Award vesting rights percentage	164.00%
Forfeited in period (in shares)	97,543
Performance Shares Vesting Over Two Periods Ending September 30, 2021
Share-based compensation
Granted (in shares)	313,771
Award vesting rights percentage	57.00%
Forfeited in period (in shares)	178,159
Performance Shares Vesting One-Year Anniversary Of Attainment [Member]
Share-based compensation
Award vesting rights percentage	50.00%
Vesting period	1 year

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Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value2

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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