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New Accounting Pronouncements - Schedule of Impact of Adoption of New Revenue Standard on Consolidated Statements of Operations Line Items (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Revenue Initial Application Period Cumulative Effect Transition [Line Items]    
Revenue $ 241,937 $ 236,921
Cost of sales 178,459 177,672
Income from operations 8,986 9,003
Income before income tax provision 6,470 6,461
Income tax provision 1,560 2,249
Net income 4,910 $ 4,212
Balances without adoption of ASC Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]    
Revenue Initial Application Period Cumulative Effect Transition [Line Items]    
Revenue 241,130  
Cost of sales 178,252  
Income from operations 8,386  
Income before income tax provision 5,870  
Income tax provision 1,423  
Net income 4,447  
Impact of adoption Higher/(Lower) [Member] | Accounting Standards Update 2014-09 [Member]    
Revenue Initial Application Period Cumulative Effect Transition [Line Items]    
Revenue 807  
Cost of sales 207  
Income from operations 600  
Income before income tax provision 600  
Income tax provision 137  
Net income $ 463