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STOCKHOLDERS' EQUITY: - Narrative (Details) - USD ($) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 13, 2018 | Oct. 25, 2018 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019 | Nov. 03, 2020
Equity [Abstract] |  |  |  |  |  |
Common stock, shares authorized |  |  | 200,000,000 | 200,000,000 |  |
Common stock, par or stated value (in dollars per share) |  |  | $ 0.10 | $ 0.10 |  |
Preferred stock, shares authorized |  |  | 1,000,000 | 1,000,000 |  |
Preferred stock, par or stated value (in dollars per shares) |  |  | $ 1.00 | $ 1.00 |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Acquisition of treasury stock |  |  | $ 42,312,000 | $ 182,190,000 | $ 74,421,000 |
Treasury stock, at cost (in shares) |  |  | 79,600,000 | 78,100,000 |  |
Treasury stock, at cost |  |  | $ 2,026,518,000 | $ 1,974,286,000 |  |
Acquisition of treasury stock from tender offer |  |  | 0 | 0 | $ 503,393,000 |
Accumulated other comprehensive income (loss), foreign currency translation adjustment |  |  | $ 7,500,000 | $ 5,700,000 |  |
Restricted stock units | Share-based Payment Arrangement, Tranche Three |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Forfeited in period (in shares) |  |  | 700,000 |  | 500,000 |
Compensation costs |  |  | $ 21,400,000 |  | $ 19,800,000 |
Incremental compensation cost |  |  | 8,400,000 |  | 14,300,000 |
Accelerated original grant date fair value compensation cost |  |  | $ 13,000,000.0 |  | 5,500,000 |
Time Vesting Restricted Stock Units |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Incremental compensation cost |  |  |  |  | $ 27,000,000.0 |
Conversion percentage |  |  |  |  | 200.00% |
Common Stock Repurchase Program |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  | $ 1,000,000,000.0
Acquisition of treasury stock (in shares) |  |  | 1,300,000 | 4,400,000 | 2,400,000 |
Acquisition of treasury stock |  |  | $ 42,300,000 | $ 182,200,000 | $ 74,400,000 |
Treasury stock, at cost (in shares) |  |  | 28,200,000 |  |  |
Treasury stock, at cost |  |  | $ 673,600,000 |  |  |
Stock repurchase program, remaining amount |  |  | $ 326,400,000 |  |  |
Dutch Auction Tender Offer |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Stock repurchase program, authorized amount |  | $ 500,000,000 |  |  |  |
Treasury stock, at cost (in shares) | 11,200,000 |  |  |  |  |
Repurchase of common stock, percentage |  | 2.00% | 14.20% |  |  |
Treasury stock cost per share (in dollar per share) | $ 44.50 |  |  |  |  |
Acquisition of treasury stock from tender offer | $ 503,400,000 |  |  |  |  |

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