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STOCKHOLDERS' EQUITY: - Narrative (Details) - USD ($) |  | 9 Months Ended | 12 Months Ended | 17 Months Ended
--- | --- | --- | --- | ---
Oct. 25, 2018 | Dec. 31, 2018 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2020
Stockholders' Equity, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |
Common stock, shares authorized |  |  | 200,000,000 | 200,000,000 |  | 200,000,000
Common stock, par or stated value (in dollars per share) |  |  | $ 0.10 | $ 0.10 |  | $ 0.10
Preferred stock, shares authorized |  |  | 1,000,000 | 1,000,000 |  | 1,000,000
Preferred stock, par or stated value (in dollars per shares) |  |  | $ 1.00 | $ 1.00 |  | $ 1.00
Stockholders' Equity Note [Abstract] |  |  |  |  |  |
Acquisition of treasury stock (in shares) |  |  |  |  |  | 26,900,000
Acquisition of treasury stock |  |  | $ 182,190,000 | $ 74,421,000 | $ 88,884,000 | $ 631,200,000
Stock repurchase program, remaining amount |  |  | $ 368,800,000 |  |  | $ 368,800,000
Treasury stock, at cost (in shares) |  |  | 78,100,000 | 73,200,000 |  | 78,100,000
Acquisition of treasury stock from tender offer |  |  | $ 0 | $ 503,393,000 | $ 0 |
Total shares reserved for issuance since inception of the stock option and equity compensation plans (in shares) |  |  |  | 42,300,000 |  |
Restricted stock units | Share-based Payment Arrangement, Tranche Three |  |  |  |  |  |
Stockholders' Equity Note [Abstract] |  |  |  |  |  |
Incremental compensation cost |  |  | $ 14,300,000 |  |  |
Forfeited in period (in shares) |  |  |  | 500,000 |  |
Compensation costs |  |  |  | $ 19,800,000 |  |
Incremental compensation cost |  |  |  | 5,500,000 |  |
Performance stock | Shares Vesting Based On Relevant Performance Period At March 31 2018 |  |  |  |  |  |
Stockholders' Equity Note [Abstract] |  |  |  |  |  |
Award vesting rights percentage |  |  | 0.00% |  |  |
Time Vesting Restricted Stock Units |  |  |  |  |  |
Stockholders' Equity Note [Abstract] |  |  |  |  |  |
Incremental compensation cost |  |  |  | $ 27,000,000.0 |  |
Conversion percentage |  |  |  | 200.00% |  |
Amended Common Stock Repurchase Plan |  |  |  |  |  |
Stockholders' Equity Note [Abstract] |  |  |  |  |  |
Stock repurchase program, authorized amount | $ 500,000,000 |  |  |  |  |
Acquisition of treasury stock (in shares) |  |  |  | 2,400,000 | 3,300,000 |
Acquisition of treasury stock |  |  |  | $ 74,400,000 | $ 88,900,000 |
Dutch Auction Tender Offer |  |  |  |  |  |
Stockholders' Equity Note [Abstract] |  |  |  |  |  |
Stock repurchase program, authorized amount | $ 500,000,000 |  |  |  |  |
Repurchase of common stock, percentage | 2.00% |  | 14.20% |  |  |
Treasury stock, at cost (in shares) |  | 11,200,000 |  |  |  |
Treasury stock cost per share (in dollar per share) |  | $ 44.50 |  |  |  |
Acquisition of treasury stock from tender offer |  | $ 503,400,000 |  |  |  |
Common Stock Repurchase Program |  |  |  |  |  |
Stockholders' Equity Note [Abstract] |  |  |  |  |  |
Stock repurchase program, authorized amount | $ 1,000,000,000.0 |  |  |  |  |
Acquisition of treasury stock (in shares) |  |  | 4,400,000 |  |  |
Acquisition of treasury stock |  |  | $ 182,200,000 |  |  |
Amended and Restated 2005 Equity Compensation Plan |  |  |  |  |  |
Stockholders' Equity Note [Abstract] |  |  |  |  |  |
Shares which remained available for future grants (in shares) |  |  |  | 37,900,000 | 32,900,000 |
Total shares reserved for issuance since inception of the stock option and equity compensation plans (in shares) |  |  |  | 34,500,000 |  |

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