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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Revenue	$ 1,177,371	$ 1,052,320	$ 942,050
Cost of sales	879,138	787,005	716,022
Gross profit	298,233	265,315	226,028
Selling, general, and administrative expenses	235,050	220,026	185,776
Income from operations	63,183	45,289	40,252
Interest expense	9,903	7,481	5,462
Income before income tax provision	53,280	37,808	34,790
Income tax provision	13,968	14,261	12,208
Net income	$ 39,312	$ 23,547	$ 22,582
Basic net income per common share	$ 1.77	$ 0.98	$ 0.93
Diluted net income per common share	$ 1.71	$ 0.95	$ 0.91
Weighted average number of common shares used in computing net income per common share:
Basic	22,269,378	23,966,611	24,203,947
Diluted	23,030,662	24,678,800	24,820,847

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