Organization and Significant Accounting Policies - Customers as Percentage of Total Revenues (Detail) - Sales [Member] - Customer Concentration Risk [Member]	3 Months Ended	6 Months Ended
Jun. 26, 2020	Jun. 28, 2019	Jun. 26, 2020	Jun. 28, 2019
Concentration Risk [Line Items]
Total	65.40%	60.30%	66.70%	60.50%
Lam Research Corporation [Member]
Concentration Risk [Line Items]
Total	39.60%	40.80%	42.00%	40.30%
Applied Materials, Inc. [Member]
Concentration Risk [Line Items]
Total	25.80%	19.50%	24.70%	20.20%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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