Restructuring and Other Charges (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Cadence's Restructuring Plans
Beginning Balance	$ 24,460	$ 1,137	$ 6,210
Restructuring and other charges (credits), net	9,406	40,955	4,511
Restructuring Activities Non Cash Charges Adjustments		(159)	(116)
Cash payments	(20,356)	(17,569)	(9,381)
Effect of foreign currency translation	274	96	(87)
Ending Balance	13,784	24,460	1,137
Severance and Benefits [Member]
Cadence's Restructuring Plans
Beginning Balance	24,402	751	4,462
Restructuring and other charges (credits), net	9,027	40,411	3,636
Restructuring Activities Non Cash Charges Adjustments		0	0
Cash payments	(20,170)	(16,890)	(7,322)
Effect of foreign currency translation	276	130	(25)
Ending Balance	13,535	24,402	751
Excess Facilities [Member]
Cadence's Restructuring Plans
Beginning Balance	58	386	1,267
Restructuring and other charges (credits), net	379	544	1,095
Restructuring Activities Non Cash Charges Adjustments		(159)	(116)
Cash payments	(186)	(679)	(1,798)
Effect of foreign currency translation	(2)	(34)	(62)
Ending Balance	249	58	386
Other [Member]
Cadence's Restructuring Plans
Beginning Balance	0	0	481
Restructuring and other charges (credits), net		0
Restructuring Reserve, Accrual Adjustment	0		(220)
Restructuring Activities Non Cash Charges Adjustments		0	0
Cash payments	0	0	(261)
Effect of foreign currency translation	0	0	0
Ending Balance	$ 0	$ 0	$ 0