Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail)

v3.3.1.900
Fair Value Measurements - Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Sep. 26, 2015
Sep. 27, 2014
Assets:    
Total assets   $ 9,990
Liabilities:    
Total liabilities $ 3,625 4,414
Liability for Contingent Consideration [Member]    
Liabilities:    
Total liabilities 3,625 4,414
Short Term Investments [Member]    
Assets:    
Total assets   9,990
Level 1 [Member]    
Assets:    
Total assets   9,990
Liabilities:    
Total liabilities 0 0
Level 1 [Member] | Liability for Contingent Consideration [Member]    
Liabilities:    
Total liabilities 0 0
Level 1 [Member] | Short Term Investments [Member]    
Assets:    
Total assets   9,990
Level 2 [Member]    
Assets:    
Total assets   0
Liabilities:    
Total liabilities 0 0
Level 2 [Member] | Liability for Contingent Consideration [Member]    
Liabilities:    
Total liabilities 0 0
Level 2 [Member] | Short Term Investments [Member]    
Assets:    
Total assets   0
Level 3 [Member]    
Assets:    
Total assets   0
Liabilities:    
Total liabilities 3,625 4,414
Level 3 [Member] | Liability for Contingent Consideration [Member]    
Liabilities:    
Total liabilities $ 3,625 4,414
Level 3 [Member] | Short Term Investments [Member]    
Assets:    
Total assets   $ 0