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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Income Statement [Abstract]        
Revenue $ 610,106 $ 523,095 $ 1,082,797 $ 934,618
Cost of sales 404,791 366,289 710,283 654,411
Gross profit 205,315 156,806 372,514 280,207
Selling, general, and administrative expenses 133,532 103,936 253,529 195,354
Income from operations 71,783 52,870 118,985 84,853
Interest expense 654 1,092 1,291 2,360
Income before income tax provision 71,129 51,778 117,694 82,493
Income tax provision 17,622 12,843 28,244 19,958
Net income $ 53,507 $ 38,935 $ 89,450 $ 62,535
Basic net income per common share $ 2.45 $ 1.76 $ 4.09 $ 2.83
Diluted net income per common share $ 2.37 $ 1.69 $ 3.96 $ 2.73
Weighted average number of common shares used in computing net income per common share:        
Basic 21,861,438 22,143,043 21,880,558 22,083,827
Diluted 22,530,102 22,986,061 22,597,105 22,864,950