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Share-Based Compensation and Stock Repurchases - Schedule of Restricted Share Activity (Detail) - Restricted Stock [Member]
6 Months Ended
Mar. 31, 2023
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Unvested, Beginning Balance 1,172,493
Number of Shares, Granted 316,618
Number of Shares, Vested (178,161)
Number of Shares, Unvested, Ending Balance 1,310,950
Weighted-Average Grant Date Fair Value, Unvested, Beginning Balance | $ / shares $ 4.43
Weighted-Average Grant Date Fair Value, Vested | $ / shares 2.85
Weighted-Average Grant Date Fair Value, Unvested, Ending Balance | $ / shares $ 4.25