Restructuring Charges Related to Previously Recorded Charges (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Jun. 27, 2014	Jun. 27, 2014
Restructuring Cost and Reserve [Line Items]
Accretion of interest expense	$ 10	$ 31
Accrued Compensation
Restructuring Cost and Reserve [Line Items]
Balance as of September 27, 2013		483
Cash paid		(456)
Balance as of June 27, 2014	27	27
Other Current Liabilities
Restructuring Cost and Reserve [Line Items]
Balance as of September 27, 2013		823
Accretion of interest expense		31
Cash paid		(594)
Reclassifications from other long-term liabilities to other current liabilities		347
Balance as of June 27, 2014	607	607
Other Long-term Liabilities
Restructuring Cost and Reserve [Line Items]
Balance as of September 27, 2013		1,651
Reclassifications from other long-term liabilities to other current liabilities		(347)
Balance as of June 27, 2014	$ 1,304	$ 1,304