Annual report pursuant to Section 13 and 15(d)

Condensed Financial Statements of Registrant - Income Statement (Detail)

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Condensed Financial Statements of Registrant - Income Statement (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Condensed Financial Statements, Captions [Line Items]    
Equity in net income of subsidiaries $ 1,337 $ 1,259
Equity-based compensation expense (400)  
General and administrative expenses (62,724) (55,303)
Interest income, net (1,861) (1,270)
Income before provision for income taxes and earnings from investment in joint venture 55,693 60,057
Income tax benefit (13,909) (10,525)
Net income $ 43,121 $ 50,791
Net income per share attributable to common stockholders:    
Basic (in dollars per share) $ 0.84 $ 1.11
Diluted (in dollars per share) $ 0.84 $ 1.11
Weighted average number of common shares outstanding:    
Basic (in shares) 51,421,159 45,605,845
Diluted (in shares) 51,427,220 45,919,648
Construction Partners Inc    
Condensed Financial Statements, Captions [Line Items]    
Equity in net income of subsidiaries $ 45,631 $ 51,515
Equity-based compensation expense (957) (975)
General and administrative expenses (3,369) (1,542)
Interest income, net 373 72
Income before provision for income taxes and earnings from investment in joint venture 41,678 49,070
Income tax benefit 1,443 1,721
Net income $ 43,121 $ 50,791
Net income per share attributable to common stockholders:    
Basic (in dollars per share) $ 0.84 $ 1,110
Diluted (in dollars per share) $ 0.84 $ 1,110
Weighted average number of common shares outstanding:    
Diluted (in shares) 51,427,220 45,919,648