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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 12 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Revenue Initial Application Period Cumulative Effect Transition [Line Items]                      
Revenue $ 398,762 $ 498,304 $ 308,475 $ 304,172 $ 308,136 $ 383,494 $ 303,586 $ 241,937 $ 1,509,713 $ 1,237,153 $ 1,177,371
Cost of sales 282,296 374,851 229,699 224,154 220,694 285,784 229,384 178,459 1,111,000 914,321 879,138
Income from operations 32,752 48,615 9,716 15,632 12,578 28,742 10,226 8,986 106,715 60,532 63,183
Income before income tax provision 31,967 46,482 6,703 12,288 9,484 25,806 7,193 6,470 97,440 48,953 53,280
Income tax provision 6,384 11,555 1,638 3,229 2,799 6,719 1,890 1,560 22,806 12,968 13,968
Net income $ 25,583 $ 34,927 $ 5,065 $ 9,059 $ 6,685 $ 19,087 $ 5,303 $ 4,910 $ 74,634 35,985 $ 39,312
Balances without adoption of ASC Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]                      
Revenue Initial Application Period Cumulative Effect Transition [Line Items]                      
Revenue                   1,237,899  
Cost of sales                   914,939  
Income from operations                   60,660  
Income before income tax provision                   49,081  
Income tax provision                   13,002  
Net income                   36,079  
Impact of adoption Higher/(Lower) [Member] | Accounting Standards Update 2014-09 [Member]                      
Revenue Initial Application Period Cumulative Effect Transition [Line Items]                      
Revenue                   (746)  
Cost of sales                   (618)  
Income from operations                   (128)  
Income before income tax provision                   (128)  
Income tax provision                   (34)  
Net income                   $ (94)