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SUBSEQUENT EVENTS (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 3 Months Ended
--- | --- | --- | --- | ---
Feb. 08, 2019 | Jan. 17, 2019 | Feb. 08, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017
Repurchase Agreement Counterparty [Line Items] |  |  |  |  |  |  |  |  |
Value of total number of shares purchased |  |  |  | $ 206,315 | $ 112,764 |  |  | $ 34,493 | $ 116,761
Common Stock |  |  |  |  |  |  |  |  |
Repurchase Agreement Counterparty [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchased and retired (in shares) |  |  |  | 2,287,975 | 1,238,163 | 586,924 | 757,219 | 602,192 | 2,148,832
Common stock repurchased, average price per share (in usd per share) |  |  |  | $ 90.17 | $ 91.07 | $ 70.11 | $ 69.48 |  |
Value of total number of shares purchased |  |  |  | $ 2 | $ 1 | $ 41,100 | $ 52,600 |  | $ 2
Common Stock | November Repurchase Program |  |  |  |  |  |  |  |  |
Repurchase Agreement Counterparty [Line Items] |  |  |  |  |  |  |  |  |
Remaining authorization at the end of the period |  |  |  | $ 187,200 |  |  |  |  |
Subsequent event |  |  |  |  |  |  |  |  |
Repurchase Agreement Counterparty [Line Items] |  |  |  |  |  |  |  |  |
Dividends declared per share (in usd per share) | $ 0.25 |  |  |  |  |  |  |  |
Subsequent event | Synopsys Inc. |  |  |  |  |  |  |  |  |
Repurchase Agreement Counterparty [Line Items] |  |  |  |  |  |  |  |  |
Litigation settlement, amount awarded to other party |  | $ 18,000 |  |  |  |  |  |  |
Subsequent event | Common Stock |  |  |  |  |  |  |  |  |
Repurchase Agreement Counterparty [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchased and retired (in shares) |  |  | 91,249 |  |  |  |  |  |
Common stock repurchased, average price per share (in usd per share) |  |  | $ 98.63 |  |  |  |  |  |
Value of total number of shares purchased |  |  | $ 9,000 |  |  |  |  |  |
Subsequent event | Common Stock | November Repurchase Program |  |  |  |  |  |  |  |  |
Repurchase Agreement Counterparty [Line Items] |  |  |  |  |  |  |  |  |
Remaining authorization at the end of the period | $ 178,200 |  | $ 178,200 |  |  |  |  |  |

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