v3.23.1

Revenues from contracts with customers - Narrative (Details) | 9 Months Ended
--- | ---
Mar. 31, 2023 region
Revenue from Contract with Customer [Abstract] |
Number of geographic regions | 3

X
- Definition Number Of Geographic Regions + References No definition available. + Details
Name: | fn_NumberOfGeographicRegions
Namespace Prefix: | fn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration