Stock Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Jan. 02, 2022	Jan. 03, 2021	Dec. 29, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total income tax benefit recognized for stock-based compensation	$ 14,000	$ 17,200	$ 11,600
Aggregate intrinsic value for stock options outstanding	$ 97,400
Weighted average remaining contractual term of options (in years)	5 years 1 month 6 days
Aggregate intrinsic value for stock options exercisable	$ 50,100
Weighted average remaining contractual term of options exercisable (in years)	3 years
Number of shares vested and expected to vest in the future	1,200,000
Aggregate intrinsic value of vested and expected to vest stock options	$ 97,400
Weighted average remaining contractual term for options vested and expected to vest	5 years 1 month 6 days
Total pre-tax stock-based compensation expense	$ 32,780	29,126	31,514
Acceleration of executive compensation			7,700
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair value of stock granted (per share)	$ 159.60
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	27,000
Fair value of restricted stock awards vested	$ 11,600	14,000	12,000
Total pre-tax stock-based compensation expense	18,800	$ 10,800	$ 12,700
Total unrecognized compensation cost, net of estimated forfeitures, related to nonvested stock, granted	$ 72,300
Shares/units granted	508,000
Awards/units outstanding	637,000	296,000
Weighted-average period for recognition of unrecognized compensation cost, years	1 year 10 months 24 days
Option vesting period (in years)	3 years
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized under plan	5,000,000
Weighted-average grant-date fair value of stock granted (per share)	$ 168.11	$ 105.23	$ 82.25
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date	95.00%
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate	10.00%
Shares/units granted	21,578	38,727	33,843
Shares available for grant under employee stock purchase plan	800,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair value of options	$ 40.00	$ 18.98	$ 22.63
Total intrinsic value of options exercised	$ 32,400	$ 51,100	$ 19,100
Cash received from option exercises	25,100	37,700	19,700
Total pre-tax stock-based compensation expense	6,300	$ 3,600	$ 6,700
Total unrecognized compensation cost, net of estimated forfeitures, related to nonvested stock, granted	$ 22,500
Weighted-average period for recognition of unrecognized compensation cost, years	2 years 6 months
Option vesting period (in years)		3 years
Stock Options Expiration Period After Date of Grant		7 years
2019 Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized under plan			6,250,000

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