Fair Value Measurements of Contingent Consideration (Detail) (Fair Value, Inputs, Level 3, Probability Of Achieving, USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 28, 2012	Sep. 28, 2012
Revenue Earnout
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value Measurements, Valuation Technique	N/A	N/A
Fair Value, Unobservable Inputs	Probability of Achieving	Probability of Achieving
Fair Value Inputs	0.00%	0.00%
Business Development Earnout
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value Measurements, Valuation Technique	N/A	N/A
Fair Value, Unobservable Inputs	Probability of Achieving	Probability of Achieving
Fair Value Inputs	0.00%	0.00%
Income Approach Valuation Technique | Product Development Earnout (1 of 2)
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value Measurements, Valuation Technique	Income Approach	Income Approach
Fair Value, Unobservable Inputs	Probability of Achieving	Probability of Achieving
Fair Value Inputs	0.00%	0.00%
Income Approach Valuation Technique | Product Development Earnout (2 of 2)
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Liability, Fair Value	2,500	2,500
Fair Value Measurements, Valuation Technique	Income Approach	Income Approach
Fair Value, Unobservable Inputs	Probability of Achieving	Probability of Achieving
Fair Value Inputs	100.00%	100.00%
Income Approach Valuation Technique | Product Development Earnout (2 of 2) | Minimum
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value Inputs	90.00%	90.00%
Income Approach Valuation Technique | Product Development Earnout (2 of 2) | Maximum
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value Inputs	100.00%	100.00%