Concentration of Credit and Other Risks (Details) - Customer Concentration Risk	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019	Dec. 28, 2019
Revenue from Contract with Customer Benchmark
Concentration Risk [Line Items]
Concentration risk percentage	56.90%	49.30%	32.40%	44.40%
Revenue from Contract with Customer Benchmark | Intel Corporation
Concentration Risk [Line Items]
Concentration risk percentage	25.60%	23.90%	32.40%	23.80%
Revenue from Contract with Customer Benchmark | Taiwan Semiconductor Manufacturing Co.,LTD.
Concentration Risk [Line Items]
Concentration risk percentage	10.60%
Revenue from Contract with Customer Benchmark | Samsung Electronics., LTD.
Concentration Risk [Line Items]
Concentration risk percentage	10.60%			10.00%
Revenue from Contract with Customer Benchmark | Micron Technology, Inc.
Concentration Risk [Line Items]
Concentration risk percentage	10.10%	11.90%
Revenue from Contract with Customer Benchmark | SK Hynix Inc.
Concentration Risk [Line Items]
Concentration risk percentage		13.50%		10.60%
Accounts Receivable | Major Customer 1
Concentration Risk [Line Items]
Concentration risk percentage			26.60%		25.70%
Accounts Receivable | Major Customer 2
Concentration Risk [Line Items]
Concentration risk percentage			18.30%		15.10%
Accounts Receivable | Major Customer 3
Concentration Risk [Line Items]
Concentration risk percentage					11.50%