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Subsequent events - Additional Information (Detail) - Major purchases of assets [member] - Brand names [member] - JeanneLanvinS.a [Member] - JPY (¥)
Mar. 30, 2023
Jun. 30, 2023
Disclosure of non-adjusting events after reporting period [line items]    
Borrowings rates 9.10%  
Interest payable   ¥ 84,502,623
Percentage of upfront fee 2.50%  
Upfront fee amount ¥ 92,860,026  
Purchase of intangible assets, trademarks 3,357,520,000  
Meritz [Member]    
Disclosure of non-adjusting events after reporting period [line items]    
Notional amount ¥ 3,714,401,030