v3.25.1

Cash, cash equivalents and short-term investments - Narrative (Details)	9 Months Ended
	Mar. 28, 2025
Minimum
Cash, cash equivalents and marketable securities [Line Items]
Maturities period of marketable securities	3 months
Maximum
Cash, cash equivalents and marketable securities [Line Items]
Maturities period of marketable securities	3 years

X

- Definition

Cash, Cash Equivalents And Marketable Securities

+ References

No definition available.

+ Details

Name:	fn_CashCashEquivalentsAndMarketableSecuritiesLineItems
Namespace Prefix:	fn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Marketable securities maturity period.

+ References

No definition available.

+ Details

Name:	fn_MarketableSecuritiesMaturityPeriod
Namespace Prefix:	fn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: