Capital Stock - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended
	Oct. 31, 2023	Jan. 31, 2023
Class Of Stock [Line Items]
Preference shares, shares authorized	20,000,000	20,000,000
Preference shares, par value	$ 0.00045	$ 0.00045
Preference shares, shares issued	0	0
Preference shares, shares outstanding	0	0
Stock Repurchase Program [Member]
Class Of Stock [Line Items]
Stock repurchased, shares	0
Amount available under stock repurchase program	$ 49.0