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Quarterly Financial Data - Summary of Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Quarterly Financial Information Disclosure [Abstract]                      
Net revenues $ 64,153 $ 84,797 $ 57,296 $ 47,421 $ 50,846 $ 48,440 $ 50,248 $ 51,480 $ 253,667 $ 201,014 $ 213,571
Gross profit 38,331 55,905 34,455 27,557 29,182 28,304 29,406 31,836 156,248 118,728 131,033
Net earnings $ 6,493 $ 27,507 $ 9,359 $ 2,827 $ 4,103 $ 5,079 $ 7,094 $ 8,106 $ 46,186 $ 24,382 $ 23,849
Basic earnings per common share $ 0.15 $ 0.64 $ 0.22 $ 0.07 $ 0.10 $ 0.12 $ 0.17 $ 0.19 $ 1.08 $ 0.57 $ 0.56
Diluted earnings per common share $ 0.15 $ 0.64 0.22 0.07 $ 0.10 $ 0.12 0.17 0.19 $ 1.07 0.57 0.56
Cash dividends per common share     $ 0 $ 0     $ 0.125 $ 0.125   $ 0.250 $ 0.500