Stock-Based Awards - Summary of Restricted Stock Unit Activity (Detail) - Restricted Stock Units [Member] shares in Thousands	9 Months Ended
	Jun. 30, 2023 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested, beginning balance | shares	219
Granted | shares	277
Vested | shares	(56)
Cancelled | shares	(17)
Unvested, ending balance | shares	423
Weighted Average Grant Date Fair Value, Unvested beginning balance | $ / shares	$ 64.03
Weighted Average Grant Date Fair Value, Granted | $ / shares	45
Weighted Average Grant Date Fair Value, Vested | $ / shares	61.1
Weighted Average Grant Date Fair Value, Cancelled | $ / shares	54.92
Weighted Average Grant Date Fair Value, Unvested ending balance | $ / shares	$ 52.32