Capital Stock - Additional Information (Detail) - USD ($) $ in Millions		9 Months Ended
	Jun. 30, 2025	Oct. 31, 2024	Jan. 31, 2024
Class Of Stock [Line Items]
Preference shares, shares issued		0	0
Preference shares, shares outstanding		0	0
Share Repurchase Program [Member]
Class Of Stock [Line Items]
Stock repurchased, shares		0
Amount available under stock repurchase program		$ 49.0
Share Repurchase Program [Member] | Forecast [Member]
Class Of Stock [Line Items]
Stock repurchase program, expiration date	Jun. 30, 2025
ESPP [Member]
Class Of Stock [Line Items]
Additional ordinary shares reserved for issuance		994,543
ESPP [Member] | Scenario, plan automatically increased by the lessor of [Member]
Class Of Stock [Line Items]
Annual increase in ordinary shares for available for future issuance		1,500,000
Annual shares increase for future issuance by percentage under 2012 employee stock purchase plan		1.25%
2021 EIP [Member]
Class Of Stock [Line Items]
Additional ordinary shares reserved for issuance		1,750,000
Ordinary shares reserved for issuance		3,100,000
Maximum number of ordinary shares reserved for issuance		6,834,208