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Business segments and other information - segment result (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jul. 01, 2018 USD ($) | Apr. 01, 2018 USD ($) | Dec. 31, 2017 USD ($) | Oct. 01, 2017 USD ($) | Jul. 02, 2017 USD ($) | Apr. 02, 2017 USD ($) | Dec. 31, 2018 USD ($) segment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  | 7 |  |
Net revenues | $ 641,615 | $ 609,672 | $ 609,866 | $ 587,230 | $ 595,106 | $ 534,703 | $ 528,613 | $ 487,881 | $ 2,448,383 | $ 2,146,303 | $ 1,868,027
Operating Profit |  |  |  |  |  |  |  |  | 321,704 | 372,279 | 319,453
Depreciation and Amortization |  |  |  |  |  |  |  |  | 214,714 | 160,338 | 128,346
Operating Segments |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Profit |  |  |  |  |  |  |  |  | 490,317 | 450,627 | 422,827
Segment Reconciling Items |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Profit |  |  |  |  |  |  |  |  | (168,613) | (78,348) | (103,374)
Vascular North America |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 329,473 | 313,618 | 295,206
Depreciation and Amortization |  |  |  |  |  |  |  |  | 27,535 | 31,058 | 35,117
Vascular North America | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Profit |  |  |  |  |  |  |  |  | 98,505 | 77,036 | 77,122
Interventional North America |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 261,645 | 220,611 | 82,431
Depreciation and Amortization |  |  |  |  |  |  |  |  | 34,127 | 29,108 | 6,993
Interventional North America | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Profit |  |  |  |  |  |  |  |  | 62,242 | 25,972 | 13,264
Anesthesia North America |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 205,064 | 197,982 | 198,772
Depreciation and Amortization |  |  |  |  |  |  |  |  | 10,162 | 8,573 | 10,932
Anesthesia North America | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Profit |  |  |  |  |  |  |  |  | 61,159 | 62,901 | 55,544
Surgical North America |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 166,267 | 175,216 | 172,223
Depreciation and Amortization |  |  |  |  |  |  |  |  | 8,321 | 8,694 | 10,459
Surgical North America | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Profit |  |  |  |  |  |  |  |  | 62,934 | 63,931 | 56,608
EMEA |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 603,813 | 552,722 | 510,934
Depreciation and Amortization |  |  |  |  |  |  |  |  | 47,171 | 34,322 | 30,505
EMEA | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Profit |  |  |  |  |  |  |  |  | 106,090 | 92,430 | 84,392
Asia |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 286,895 | 269,208 | 249,416
Depreciation and Amortization |  |  |  |  |  |  |  |  | 12,917 | 11,868 | 11,275
Asia | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Profit |  |  |  |  |  |  |  |  | 78,135 | 75,637 | 75,770
OEM |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 205,976 | 182,967 | 160,990
Depreciation and Amortization |  |  |  |  |  |  |  |  | 8,610 | 8,337 | 8,404
OEM | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Profit |  |  |  |  |  |  |  |  | 50,294 | 41,578 | 33,641
All Other |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 389,250 | 233,979 | 198,055
Depreciation and Amortization |  |  |  |  |  |  |  |  | 65,871 | 28,378 | 14,661
All Other | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Profit |  |  |  |  |  |  |  |  | $ (29,042) | $ 11,142 | $ 26,486

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