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)

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Fair Value Measurements - Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 24, 2016
Liabilities:    
Total liabilities $ 9,343 $ 5,113
Liability for Contingent Consideration    
Liabilities:    
Total liabilities 9,343 5,113
Level 1    
Liabilities:    
Total liabilities 0 0
Level 1 | Liability for Contingent Consideration    
Liabilities:    
Total liabilities 0 0
Level 2    
Liabilities:    
Total liabilities 0 0
Level 2 | Liability for Contingent Consideration    
Liabilities:    
Total liabilities 0 0
Level 3    
Liabilities:    
Total liabilities 9,343 5,113
Level 3 | Liability for Contingent Consideration    
Liabilities:    
Total liabilities $ 9,343 $ 5,113