Fair Value Measurements - Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Jun. 28, 2014	Sep. 28, 2013	Jun. 29, 2013
Assets:
Total assets	$ 14,220	$ 17,820	$ 17,820
Liabilities:
Total liabilities	4,414	4,165	197
Derivative Liabilities [Member]
Liabilities:
Total liabilities			197
Liability for Contingent Consideration [Member]
Liabilities:
Total liabilities	4,414	4,165
Certificates of Deposit [Member]
Assets:
Total assets	14,220	17,820	17,820
Level 1 [Member]
Assets:
Total assets	0	0	0
Liabilities:
Total liabilities	0	0	0
Level 1 [Member] | Derivative Liabilities [Member]
Liabilities:
Total liabilities			0
Level 1 [Member] | Liability for Contingent Consideration [Member]
Liabilities:
Total liabilities	0	0
Level 1 [Member] | Certificates of Deposit [Member]
Assets:
Total assets	0	0	0
Level 2 [Member]
Assets:
Total assets	14,220	17,820	17,820
Liabilities:
Total liabilities	0	0	197
Level 2 [Member] | Derivative Liabilities [Member]
Liabilities:
Total liabilities			197
Level 2 [Member] | Liability for Contingent Consideration [Member]
Liabilities:
Total liabilities	0	0
Level 2 [Member] | Certificates of Deposit [Member]
Assets:
Total assets	14,220	17,820	17,820
Level 3 [Member]
Assets:
Total assets	0	0	0
Liabilities:
Total liabilities	4,414	4,165	0
Level 3 [Member] | Derivative Liabilities [Member]
Liabilities:
Total liabilities			0
Level 3 [Member] | Liability for Contingent Consideration [Member]
Liabilities:
Total liabilities	4,414	4,165
Level 3 [Member] | Certificates of Deposit [Member]
Assets:
Total assets	$ 0	$ 0	$ 0