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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Income Statement [Abstract]      
Revenue $ 1,237,153 $ 1,177,371 $ 1,052,320
Cost of sales 914,321 879,138 787,005
Gross profit 322,832 298,233 265,315
Selling, general and administrative expenses 262,300 235,050 220,026
Income from operations 60,532 63,183 45,289
Interest expense 11,579 9,903 7,481
Income before income tax provision 48,953 53,280 37,808
Income tax provision 12,968 13,968 14,261
Net income $ 35,985 $ 39,312 $ 23,547
Basic net income per common share $ 1.61 $ 1.77 $ 0.98
Diluted net income per common share $ 1.57 $ 1.71 $ 0.95
Weighted average number of common shares used in computing net income per common share:      
Basic 22,294,114 22,269,378 23,966,611
Diluted 22,881,147 23,030,662 24,678,800