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CONSOLIDATED STATEMENTS OF INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 26, 2015
Dec. 27, 2014
Income Statement [Abstract]      
Service revenue $ 1,130,733 $ 858,244 $ 797,765
Product revenue 550,699 505,058 499,897
Total revenue 1,681,432 1,363,302 1,297,662
Costs and expenses:      
Cost of services provided (excluding amortization of intangible assets) 757,732 568,227 558,578
Cost of products sold (excluding amortization of intangible assets) 277,034 263,983 266,424
Selling, general and administrative 367,548 300,414 269,033
Amortization of intangible assets 41,699 24,229 25,957
Operating income 237,419 206,449 177,670
Other income (expense):      
Interest income 1,314 1,043 1,154
Interest expense (27,709) (15,072) (11,950)
Other income (expense), net 11,897 3,008 10,721
Income from continuing operations, before income taxes 222,921 195,428 177,595
Provision for income taxes 66,835 43,391 47,671
Income from continuing operations, net of income taxes 156,086 152,037 129,924
Income (loss) from discontinued operations, net of income taxes 280 (950) (1,726)
Net income 156,366 151,087 128,198
Less: Net income attributable to noncontrolling interests 1,601 1,774 1,500
Net income attributable to common shareholders $ 154,765 $ 149,313 $ 126,698
Basic:      
Continuing operations attributable to common shareowners (in dollars per share) $ 3.28 $ 3.23 $ 2.76
Discontinued operations (in dollars per share) 0.01 (0.02) (0.04)
Net income attributable to common shareowners (in dollars per share) 3.29 3.21 2.72
Diluted:      
Continuing operations attributable to common shareowners (in dollars per share) 3.22 3.15 2.70
Discontinued operations (in dollars per share) 0.01 (0.02) (0.04)
Net income attributable to common shareowners (in dollars per share) $ 3.23 $ 3.13 $ 2.66