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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Income Statement [Abstract]      
Revenue $ 2,063,257 $ 1,509,713 $ 1,237,153
Cost of sales 1,403,824 1,111,000 914,321
Gross profit 659,433 398,713 322,832
Selling, general and administrative expenses 449,974 291,998 262,300
Income from operations 209,459 106,715 60,532
Interest expense 3,665 9,275 11,579
Income before income tax provision 205,794 97,440 48,953
Income tax provision 50,815 22,806 12,968
Net income $ 154,979 $ 74,634 $ 35,985
Basic net income per common share $ 7.04 $ 3.46 $ 1.61
Diluted net income per common share $ 6.78 $ 3.37 $ 1.57
Weighted average number of common shares used in computing net income per common share:      
Basic 22,010,130 21,547,665 22,294,114
Diluted 22,859,498 22,125,338 22,881,147