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CONSOLIDATED STATEMENTS OF INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Dec. 26, 2015
Income Statement [Abstract]      
Service revenue $ 1,298,298 $ 1,130,733 $ 858,244
Product revenue 559,303 550,699 505,058
Total revenue 1,857,601 1,681,432 1,363,302
Costs and expenses:      
Cost of services provided (excluding amortization of intangible assets) 865,618 757,732 568,227
Cost of products sold (excluding amortization of intangible assets) 289,669 277,034 263,983
Selling, general and administrative 373,446 367,548 300,414
Amortization of intangible assets 41,370 41,699 24,229
Operating income 287,498 237,419 206,449
Other income (expense):      
Interest income 690 1,314 1,043
Interest expense (29,777) (27,709) (15,072)
Other income, net 38,544 11,897 3,008
Income from continuing operations, before income taxes 296,955 222,921 195,428
Provision for income taxes 171,369 66,835 43,391
Income from continuing operations, net of income taxes 125,586 156,086 152,037
Income (loss) from discontinued operations, net of income taxes (137) 280 (950)
Net income 125,449 156,366 151,087
Less: Net income attributable to noncontrolling interests 2,094 1,601 1,774
Net income attributable to common shareholders $ 123,355 $ 154,765 $ 149,313
Basic:      
Continuing operations attributable to common shareholders (in dollars per share) $ 2.60 $ 3.28 $ 3.23
Discontinued operations (in dollars per share) 0.00 0.01 (0.02)
Net income attributable to common shareholders (in dollars per share) 2.60 3.29 3.21
Diluted:      
Continuing operations attributable to common shareholders (in dollars per share) 2.54 3.22 3.15
Discontinued operations (in dollars per share) 0.00 0.01 (0.02)
Net income attributable to common shareholders (in dollars per share) $ 2.54 $ 3.23 $ 3.13