Organization and Significant Accounting Policies - Additional Information (Detail) (USD $)	9 Months Ended				9 Months Ended					3 Months Ended		9 Months Ended					12 Months Ended
	Sep. 27, 2013 Segment	Dec. 28, 2012	Sep. 28, 2012	Dec. 30, 2011	Sep. 27, 2013 Maximum [Member]	Sep. 27, 2013 Subsidiaries [Member] China [Member]	Dec. 28, 2012 Subsidiaries [Member] China [Member]	Sep. 27, 2013 Money Market Funds [Member]	Sep. 27, 2013 Money Market Funds [Member] Level 2 [Member]	Sep. 27, 2013 Sales Revenue, Net [Member] Customer	Sep. 28, 2012 Sales Revenue, Net [Member] Customer	Sep. 27, 2013 Sales Revenue, Net [Member] Customer	Sep. 28, 2012 Sales Revenue, Net [Member] Customer	Sep. 27, 2013 Accounts Receivable [Member] Customer	Sep. 28, 2012 Accounts Receivable [Member] Customer	Sep. 27, 2013 Accounts Receivable [Member] ASM International [Member]	Dec. 28, 2012 Accounts Receivable [Member] ASM International [Member]
Concentration Risk [Line Items]
Number of customers equal or exceeding 10 % threshold										3	3	3	2	3	3
Accounts receivable balances, aggregate																79.00%	84.00%
Carrying value of cash and cash equivalent	$ 65,941,000	$ 54,311,000	$ 58,329,000	$ 52,155,000				$ 17,900,000
Fair value of cash and cash equivalent									17,900,000
Fiscal Year Duration	52-53 week
Valuation allowance on deferred tax assets						$ 851,000	$ 851,000
Product warranty period (in years)					2 years
Number of reporting segment	1
Measurement period to determine fair value of assets and liabilities					12 months