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INCOME TAXES - Unrecognized Tax Benefits, Interest & Penalties (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Unrecognized Tax Benefits |  |  |  |
Unrecognized tax benefits at the beginning of the fiscal year |  | $ 94,311,000 | $ 126,073,000 | $ 130,530,000
Unrecognized tax benefits, decrease resulting from prior period tax positions | [1] |  | (1,401,000) |
Unrecognized tax benefits, increase resulting from prior period tax positions | [1] | 10,109,000 |  | 2,152,000
Gross amount of the increases in unrecognized tax benefits as a result of tax positions taken during the current year |  | 6,669,000 | 2,565,000 | 2,660,000
Amount of decreases in unrecognized tax benefits relating the settlements with taxing authorities, including the utilization of tax attributes |  | 0 | (8,000,000) | 0
Reductions to unrecognized tax benefits resulting from the lapse of the applicable statute of limitations |  | (3,173,000) | (24,768,000) | (7,430,000)
Unrecognized Tax Benefits, Decrease Resulting from Foreign Currency Translation |  | (528,000) | (158,000) | (1,839,000)
Unrecognized tax benefits at the end of the fiscal year |  | 107,388,000 | 94,311,000 | 126,073,000
Total amounts of unrecognized tax benefits that, if upon resolution of the uncertain tax positions would reduce Cadence's effective tax rate |  | 106,420,000 | 93,398,000 | 121,415,000
Reasonably possible decrease in unrecognized tax benefits |  | 9,400,000 |  |
Interest and penalties recognized in Income Statements |  |  |  |
Interest |  | 3,893,000 | 2,282,000 | 434,000
Penalties |  | 143,000 | 267,000 | $ 7,000
Interest and penalties recognized in Balance Sheets |  |  |  |
Interest |  | 9,010,000 | 4,813,000 |
Penalties |  | $ 1,261,000 | $ 0 |
[1] | Includes unrecognized tax benefits of tax positions recorded in connection with acquisitions

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Subparagraph (d)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-15 + Details
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- Definition The amount of estimated interest accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-15 + Details
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