Quarterly report pursuant to Section 13 or 15(d)

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

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Fair Value Measurements - Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Sep. 30, 2017
Jun. 24, 2017
Liabilities:      
Total liabilities $ 7,645 $ 9,343 $ 4,095
Liability for contingent consideration      
Liabilities:      
Total liabilities 7,645 9,343 4,095
Level 1      
Liabilities:      
Total liabilities 0 0 0
Level 1 | Liability for contingent consideration      
Liabilities:      
Total liabilities 0 0 0
Level 2      
Liabilities:      
Total liabilities 0 0 0
Level 2 | Liability for contingent consideration      
Liabilities:      
Total liabilities 0 0 0
Level 3      
Liabilities:      
Total liabilities 7,645 9,343 4,095
Level 3 | Liability for contingent consideration      
Liabilities:      
Total liabilities $ 7,645 $ 9,343 $ 4,095