v3.26.1

Due to Related Party (Details) - USD ($)	Mar. 31, 2026	Sep. 30, 2025
Related Party [Member]
Due to Related Party (Details) [Line Items]
Other Borrowings	$ 121,254	$ 22,154

No definition available.

Name:	fsnt_DuetoRelatedPartyDetailsLineItems
Namespace Prefix:	fsnt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The carrying amount as of the balance sheet date for the aggregate of other miscellaneous borrowings owed by the reporting entity.

No definition available.

Name:	us-gaap_OtherBorrowings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_RelatedPartyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: