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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Income Statement [Abstract]        
Revenue $ 199,566,000 $ 172,143,000 $ 369,103,000 $ 330,269,000
Cost of sales 150,539,000 129,943,000 278,462,000 250,614,000
Gross profit 49,027,000 42,200,000 90,641,000 79,655,000
Selling, general, and administrative expenses 43,459,000 40,557,000 82,410,000 76,652,000
Income from operations 5,568,000 1,643,000 8,231,000 3,003,000
Interest expense 1,582,000 1,253,000 2,809,000 2,399,000
Income before income taxes 3,986,000 390,000 5,422,000 604,000
Income taxes 1,564,000   2,111,000 0
Net income $ 2,422,000 $ 390,000 $ 3,311,000 $ 604,000
Basic net income per common share $ 0.10 $ 0.02 $ 0.14 $ 0.02
Diluted net income per common share $ 0.10 $ 0.02 $ 0.13 $ 0.02
Weighted average number of common shares used in computing net income per common share:        
Basic 24,154,397 24,544,272 24,183,926 24,409,969
Diluted 24,696,881 25,265,857 24,699,601 25,105,262