Organization and Significant Accounting Policies - Customers as Percentage of Total Sales (Detail) - Sales [Member] - Customer Concentration Risk [Member]	12 Months Ended
	Dec. 29, 2017	Dec. 30, 2016	Dec. 25, 2015
Concentration Risk [Line Items]
Total	84.40%	82.20%	77.00%
Lam Research Corporation [Member]
Concentration Risk [Line Items]
Total	59.80%	53.30%	50.60%
Applied Materials, Inc. [Member]
Concentration Risk [Line Items]
Total	24.60%	28.90%	26.40%