Organization and Significant Accounting Policies - Customers as Percentage of Total Sales (Detail) - Sales [Member] - Customer Concentration Risk [Member]	12 Months Ended
	Dec. 25, 2015	Dec. 26, 2014	Dec. 27, 2013
Concentration Risk [Line Items]
Total	77.00%	75.70%	80.60%
Lam Research Corporation [Member]
Concentration Risk [Line Items]
Total	50.60%	38.00%	33.30%
Applied Materials, Inc. [Member]
Concentration Risk [Line Items]
Total	26.40%	22.80%	34.70%
ASM International, Inc. [Member]
Concentration Risk [Line Items]
Total		14.90%	12.60%