Assets Measured at Fair Value on Nonrecurring Basis (Detail) (USD $)	3 Months Ended	9 Months Ended
	Jun. 27, 2014	Jun. 27, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Equity investment in Augimenix, Net Carrying Value	$ 7,300,000	$ 7,300,000
Impairment of a privately-held equity investment	7,725,000	7,725,000
Fair Value, Measurements, Nonrecurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impairment of a privately-held equity investment	$ 6,300,000	$ 6,300,000