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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, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Quarterly Financial Information Disclosure [Abstract]                      
Revenue $ 308,136 $ 383,494 $ 303,586 $ 241,937 $ 308,591 $ 361,254 $ 270,605 $ 236,921 $ 1,237,153 $ 1,177,371 $ 1,052,320
Cost of sales 220,694 285,784 229,384 178,459 229,587 270,567 201,312 177,672 914,321 879,138 787,005
Gross profit 87,442 97,710 74,202 63,478 79,004 90,687 69,293 59,249 322,832 298,233 265,315
Selling, general and administrative expenses 74,864 68,968 63,976 54,492 62,056 64,089 58,659 50,246 262,300 235,050 220,026
Income from operations 12,578 28,742 10,226 8,986 16,948 26,598 10,634 9,003 60,532 63,183 45,289
Interest expense 3,094 2,936 3,033 2,516 2,022 2,499 2,840 2,542 11,579 9,903 7,481
Income before income tax provision 9,484 25,806 7,193 6,470 14,926 24,099 7,794 6,461 48,953 53,280 37,808
Income tax provision 2,799 6,719 1,890 1,560 3,386 6,723 1,610 2,249 12,968 13,968 14,261
Net income $ 6,685 $ 19,087 $ 5,303 $ 4,910 $ 11,540 $ 17,376 $ 6,184 $ 4,212 $ 35,985 $ 39,312 $ 23,547
Net income per share:                      
Diluted $ 0.31 $ 0.84 $ 0.23 $ 0.21 $ 0.50 $ 0.75 $ 0.27 $ 0.19 $ 1.57 $ 1.71 $ 0.95
Weighted average number of shares:                      
Diluted 21,896,257 22,821,202 23,417,688 23,400,685 23,286,206 23,182,546 22,940,594 22,712,648 22,881,147 23,030,662 24,678,800