Redeemable non-controlling interests - Additional Information (Detail) - CNY (¥) ¥ in Thousands		12 Months Ended
Oct. 31, 2020	Mar. 31, 2021
Redeemable preferred shares issued amount		¥ 413,377
Accretion of redemption value of the redeemable non-controlling interest		(138)
Yoken Holding Limited [Member]
Redeemable preferred shares issued amount	¥ 6,000
Percentage of preferred shares redeemable at redemption price measured by Interest per year Since Issuance of shares	10.00%
Accretion of redemption value of the redeemable non-controlling interest		¥ 100

Change in noncontrolling interest during the period as a result of a change in the redemption value of redeemable noncontrolling interest.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration