Stock Compensation Equity based compensation programs (Details) - USD ($)	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
2017 Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized, but unissued	16,000,000
Vesting period, years	3 years
Options granted remaining authorized, but unissued, shares	24,000,000
Contractual terms, years	10 years
Shares, Issued	2
Shares Reduced From Remaining Available	1
Shares Reduced From Outstanding Award	1
2013 Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, years	3 years
Options granted remaining authorized, but unissued, shares	8,000,000
Contractual terms, years	10 years
2009 Non Employee Director Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized, but unissued	500,000
Number of shares awarded	25,209	24,249	26,877
2002 Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized, but unissued	200,000
Maximum number of shares allowed to be issued under plan	2,500,000
Purchase price, percentage of fair market value of stock on last day of quarterly purchase period	95.00%
Maximum value of purchases for any employee in any calendar year	$ 25,000
Number of shares purchased by employees under plan	65,000	63,000	73,000
International Subsidiary Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares purchased by employees under plan	60,000	57,000	48,000
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	100.00%