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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Recently Adopted Accounting Changes (Details) £ in Thousands, $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 USD ($) | Dec. 30, 2017 USD ($) | Apr. 01, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 GBP (£) | Dec. 31, 2016 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Retained earnings | $ 1,996,474 | $ 1,954,344 |  | $ 1,964,115 |  |
Net sales | 698,684 |  | $ 637,473 |  |  |
Adjustments to operating income (loss) | 63,960 |  | 64,656 |  |  |
Other Nonoperating Income (Expense) | (1,141) |  | 1,045 |  |  |
Adjustments to selling, general, and administrative expense | (105,280) |  | (99,949) |  |  |
Adjustments to beginning and ending cash balance | 479,663 | 492,805 | 425,216 |  |  | $ 412,516
Adjustments to cash provided by (used in) operating activities | (33,048) |  | (23,415) |  |  |
Accounting Standards Update 2017-07 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Other Nonoperating Income (Expense) | 154 |  |  |  |  |
Adjustments to selling, general, and administrative expense | 154 |  |  |  |  |
Accounting Standards Update 2016-18 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Adjustments to beginning and ending cash balance | £ |  |  |  |  | £ 10,000 |
Adjustments to cash provided by (used in) operating activities |  |  | $ 12,568 |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Retained earnings | 13,378 | 9,771 |  | $ 9,771 |  |
Net sales | 27,810 | 51,507 |  |  |  |
Adjustments to operating income (loss) | $ 5,074 | $ 13,121 |  |  |  |

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