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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Income Statement [Abstract]      
Revenue $ 1,509,713 $ 1,237,153 $ 1,177,371
Cost of sales 1,111,000 914,321 879,138
Gross profit 398,713 322,832 298,233
Selling, general and administrative expenses 291,998 262,300 235,050
Income from operations 106,715 60,532 63,183
Interest expense 9,275 11,579 9,903
Income before income tax provision 97,440 48,953 53,280
Income tax provision 22,806 12,968 13,968
Net income $ 74,634 $ 35,985 $ 39,312
Basic net income per common share $ 3.46 $ 1.61 $ 1.77
Diluted net income per common share $ 3.37 $ 1.57 $ 1.71
Weighted average number of common shares used in computing net income per common share:      
Basic 21,547,665 22,294,114 22,269,378
Diluted 22,125,338 22,881,147 23,030,662