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Summary of Significant Accounting Policies - New Accounting Standards (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Net Income (Loss) Attributable to Parent |  | $ 345,777 |  | $ 204,101 | $ 203,086 |
Statement of Financial Position [Abstract] |  |  |  |  |  |
Receivables, net |  | 297,082 |  | 190,426 |  |
Prepaid expenses and other |  | 92,550 |  | 68,266 |  |
Long-term receivables |  | 5,972 |  | 12,239 |  |
Other assets |  | 371,231 |  | 230,301 |  |
Accounts payable and accrued liabilities |  | 256,526 | [1] | 221,101 |  |
Current portion of deferred revenue |  | 352,456 |  | 336,297 |  |
Long-term portion of deferred revenue |  | 48,718 |  | 61,513 |  |
Retained earnings |  | 772,709 |  | 341,003 |  | $ 426,932
Accumulated other comprehensive loss |  | (24,780) |  | (3,630) |  |
Income Statement [Abstract] |  |  |  |  |  |
Revenue |  | 2,138,022 |  | 1,943,032 | 1,816,083 |
Marketing and sales expense |  | 439,669 |  | 419,161 | 395,194 |
Provision for income taxes |  | $ 30,613 |  | $ 110,945 | $ 34,067 |
Net income per share - basic |  | $ 1.26 |  | $ 0.75 | $ 0.71 |
Net income per share - diluted |  | $ 1.23 |  | $ 0.73 | $ 0.70 |
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |  |  |  |  |
Deferred income taxes |  | $ (11,676) |  | $ 79,934 | $ (4,869) |
Receivables |  | 87,083 |  | 31,032 | 3,607 |
Prepaid expenses and other |  | 19,622 |  | 25,793 | 6,903 |
Other assets |  | 16,077 |  | 22,336 | 6,566 |
Accounts payable and accrued liabilities |  | 1,553 |  | (25,987) | 2,655 |
Deferred revenue |  | 100,696 |  | 33,614 | 30,742 |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |
Statement of Financial Position [Abstract] |  |  |  |  |  |
Retained earnings | [2] |  |  |  |  | 91,640
Accounting Standards Update 2016-01 [Member] |  |  |  |  |  |
Statement of Financial Position [Abstract] |  |  |  |  |  |
Retained earnings |  |  |  |  |  | 2,638
Accounting Standards Update 2016-16 [Member] |  |  |  |  |  |
Statement of Financial Position [Abstract] |  |  |  |  |  |
Retained earnings |  |  |  |  |  | (8,349)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Net Income (Loss) Attributable to Parent |  | 5,520 |  |  |  |
Statement of Financial Position [Abstract] |  |  |  |  |  |
Receivables, net |  | (12,099) |  |  |  | 47,300
Prepaid expenses and other |  | (10,055) |  |  |  |
Long-term receivables |  | (623) |  |  |  |
Other assets |  | (17,013) |  |  |  |
Accounts payable and accrued liabilities |  | (17,438) | [1] |  |  | 23,300
Current portion of deferred revenue |  | 45,119 |  |  |  | 57,400
Long-term portion of deferred revenue |  | 17,637 |  |  |  |
Retained earnings |  | (86,120) |  |  |  | $ 85,400
Accumulated other comprehensive loss |  | 1,012 |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |
Marketing and sales expense |  | 3,947 |  |  |  |
Provision for income taxes |  | $ (2,364) |  |  |  |
Net income per share - basic |  | $ 0.02 |  |  |  |
Net income per share - diluted |  | $ 0.02 |  |  |  |
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |  |  |  |  |
Deferred income taxes |  | $ (2,213) |  |  |  |
Receivables |  | 28,226 |  |  |  |
Prepaid expenses and other |  | (5,968) |  |  |  |
Other assets |  | (3,461) |  |  |  |
Accounts payable and accrued liabilities |  | 10,100 |  |  |  |
Deferred revenue |  | 5,390 |  |  |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Net Income (Loss) Attributable to Parent |  | 351,297 |  |  |  |
Statement of Financial Position [Abstract] |  |  |  |  |  |
Receivables, net |  | 284,983 |  |  |  |
Prepaid expenses and other |  | 82,495 |  |  |  |
Long-term receivables |  | 5,349 |  |  |  |
Other assets |  | 354,218 |  |  |  |
Accounts payable and accrued liabilities |  | 239,088 |  |  |  |
Current portion of deferred revenue |  | 397,575 |  |  |  |
Long-term portion of deferred revenue |  | 66,355 |  |  |  |
Retained earnings |  | 686,589 |  |  |  |
Accumulated other comprehensive loss |  | (23,768) |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |
Marketing and sales expense |  | 443,616 |  |  |  |
Provision for income taxes |  | $ 28,249 |  |  |  |
Net income per share - basic |  | $ 1.28 |  |  |  |
Net income per share - diluted |  | $ 1.25 |  |  |  |
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |  |  |  |  |
Deferred income taxes |  | $ (13,889) |  |  |  |
Receivables |  | 115,309 |  |  |  |
Prepaid expenses and other |  | 13,654 |  |  |  |
Other assets |  | 12,616 |  |  |  |
Accounts payable and accrued liabilities |  | 11,653 |  |  |  |
Deferred revenue |  | 106,086 |  |  |  |
Product and maintenance [Member] |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |
Revenue |  | 1,997,887 |  | 1,813,987 | 1,683,771 |
Cost of product and maintenance |  | 173,011 |  | 156,676 | 183,291 |
Product and maintenance [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |
Revenue |  | 1,031 |  |  |  |
Cost of product and maintenance |  | 571 |  |  |  |
Product and maintenance [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |
Revenue |  | 1,998,918 |  |  |  |
Cost of product and maintenance |  | 173,582 |  |  |  |
Technology Service [Member] |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |
Revenue |  | 140,135 |  | 129,045 | 132,312 |
Cost of product and maintenance |  | 85,736 |  | $ 80,714 | $ 73,201 |
Technology Service [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |
Revenue |  | 6,643 |  |  |  |
Technology Service [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |
Revenue |  | $ 146,778 |  |  |  |
[1] | Cadence has certain arrangements under which consideration is received from customers prior to identifying the specific goods or services to be delivered under the contract. Cadence records an accrued liability on a contract-by-contract basis at the end of each reporting period for cash consideration received.
[2] | The cumulative effect adjustment from the adoption of Revenue from Contracts with Customers (Topic 606) is presented net of the related income tax effect of $17.5 million.

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