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Quarterly Financial Data - Summary of Quarterly Financial Information (Detail) - USD ($)
$ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract]                      
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
Gross profit 116,466 123,453 78,776 80,018 87,442 97,710 74,202 63,478 398,713 322,832 298,233
Selling, general and administrative expenses 83,714 74,838 69,060 64,386 74,864 68,968 63,976 54,492 291,998 262,300 235,050
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
Interest expense 785 2,133 3,013 3,344 3,094 2,936 3,033 2,516 9,275 11,579 9,903
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
Net income per share:                      
Diluted $ 1.13 $ 1.58 $ 0.23 $ 0.41 $ 0.31 $ 0.84 $ 0.23 $ 0.21 $ 3.37 $ 1.57 $ 1.71
Weighted average number of shares:                      
Diluted 22,604,060 22,045,900 21,960,285 21,890,065 21,896,257 22,821,202 23,417,688 23,400,685 22,125,338 22,881,147 23,030,662