Revenue Recognition - Customers as Percentage of Total Sales (Detail) - Sales [Member] - Customer Concentration Risk [Member]	3 Months Ended	6 Months Ended
Jun. 28, 2019	Jun. 29, 2018	Jun. 28, 2019	Jun. 29, 2018
Concentration Risk [Line Items]
Total	60.30%	83.50%	60.50%	85.70%
Lam Research Corporation [Member]
Concentration Risk [Line Items]
Total	40.80%	61.90%	40.30%	64.20%
Applied Materials, Inc. [Member]
Concentration Risk [Line Items]
Total	19.50%	21.60%	20.20%	21.50%

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
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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