v2.4.0.8
Income Taxes - Reconciliation of Income Tax (Benefit) at U.S. Federal Statutory Rate to Company's Effective Tax Rate (Detail)
12 Months Ended
Sep. 28, 2013
Sep. 29, 2012
Sep. 24, 2011
Income Tax Disclosure [Abstract]      
Income tax provision at federal statutory rate (35.00%) (35.00%) 35.00%
Increase (decrease) in tax resulting from:      
Goodwill impairment 32.80% 3.30%  
Domestic production activities deduction (1.20%) (20.30%) (4.10%)
State income taxes, net of federal benefit (0.20%) 5.30% 3.60%
Research and investment tax credits (1.20%) (1.60%) (3.20%)
Unrecognized tax benefits 0.30% 13.50% (3.30%)
Contingent consideration 2.60% 59.80% 1.50%
Nondeductible transaction expenses   7.50%  
Cessation of Adiana   (28.60%)  
Executive compensation 0.20% 2.30% (1.10%)
Foreign rate differential 0.10% 3.10% 0.80%
Change in valuation allowance (0.80%) 5.40%  
Other 0.70% 4.70% 1.70%
Effective income tax rate (1.70%) 19.40% 30.90%