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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Income Statement [Abstract]      
Revenue $ 2,308,098 $ 2,063,257 $ 1,509,713
Cost of sales 1,502,344 1,403,824 1,111,000
Gross profit 805,754 659,433 398,713
Selling, general and administrative expenses 540,550 449,974 291,998
Income from operations 265,204 209,459 106,715
Interest expense 3,283 3,665 9,275
Income before income tax provision 261,921 205,794 97,440
Income tax provision 63,932 50,815 22,806
Net income $ 197,989 $ 154,979 $ 74,634
Basic net income per common share $ 9.12 $ 7.04 $ 3.46
Diluted net income per common share $ 8.84 $ 6.78 $ 3.37
Weighted average number of common shares used in computing net income per common share:      
Basic 21,706,225 22,010,130 21,547,665
Diluted 22,399,209 22,859,498 22,125,338