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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Income Statement [Abstract]        
Revenue $ 523,095 $ 308,475 $ 934,618 $ 612,647
Cost of sales 366,289 229,699 654,411 453,853
Gross profit 156,806 78,776 280,207 158,794
Selling, general, and administrative expenses 103,936 69,060 195,354 133,446
Income from operations 52,870 9,716 84,853 25,348
Interest expense 1,092 3,013 2,360 6,357
Income before income tax provision 51,778 6,703 82,493 18,991
Income tax provision 12,843 1,638 19,958 4,867
Net income $ 38,935 $ 5,065 $ 62,535 $ 14,124
Basic net income per common share $ 1.76 $ 0.24 $ 2.83 $ 0.66
Diluted net income per common share $ 1.69 $ 0.23 $ 2.73 $ 0.64
Weighted average number of common shares used in computing net income per common share:        
Basic 22,143,043 21,520,215 22,083,827 21,486,995
Diluted 22,986,061 21,960,285 22,864,950 21,925,105