Organization and Significant Accounting Policies - Customers as Percentage of Total Sales (Detail) - Sales [Member] - Customer Concentration Risk [Member]	3 Months Ended		9 Months Ended
	Sep. 23, 2016	Sep. 25, 2015	Sep. 23, 2016	Sep. 25, 2015
Concentration Risk [Line Items]
Total	80.40%	75.80%	80.80%	77.50%
Lam Research Corporation [Member]
Concentration Risk [Line Items]
Total	49.50%	49.40%	53.50%	50.40%
Applied Materials, Inc. [Member]
Concentration Risk [Line Items]
Total	30.90%	26.40%	27.30%	27.10%