Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Apr. 01, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 56,392	$ 66,624	[1]
Other comprehensive income, net of tax
Unrealized gain/(loss) on cash flow hedging activities, net of income tax of ($905) and $1,148	(2,616)	3,320
Total other comprehensive income (loss)	(2,616)	3,320
Comprehensive income	$ 53,776	$ 69,944

[1] Effective in the fourth quarter of fiscal year 2018, the Company made a voluntary change in accounting principle to change the classification of certain expenses on its consolidated statements of income. The change was applied retrospectively to all periods presented. See Note 2, “Summary of Significant Accounting Policies” for further information.