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Subsequent Events - Additional Information (Detail) $ / shares in Units, $ in Millions |  |  | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 14, 2018 USD ($) $ / shares shares | Aug. 08, 2018 shares | Jun. 30, 2018 shares | Sep. 30, 2017 shares
Subsequent Event [Line Items] |  |  |  |
Common stock, stock split |  |  | Effected a 2.5-for-1 stock split |
Common stock, shares authorized |  |  | 125,000,000 | 125,000,000
Preferred stock, shares authorized |  |  | 5,000,000 | 5,000,000
Subsequent Event [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Stock split ratio |  | 2.5 |  |
Common stock, shares authorized |  | 125,000,000 |  |
Preferred stock, shares authorized |  | 5,000,000 |  |
Subsequent Event [Member] | Revolving Credit Facility [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
CIT revolving credit facility outstanding | $ | $ 25.7 |  |  |
Subsequent Event [Member] | IPO [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Stock issued during period, shares, new issues | 9,630,000 |  |  |
Shares issued, price per share | $ / shares | $ 12.00 |  |  |
Gross proceeds of initial public offering | $ | $ 115.6 |  |  |

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