v3.22.4

Business segments and geographic information - Narrative (Details) - customer | Dec. 30, 2022 | Jun. 24, 2022
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Segment Reporting [Abstract] |  |
Number of customers that contributed to more than 10% of trade accounts receivable | 3 | 3

X
- Definition Number Of Major Customers Accounting For Ten Percent Or More Of Total Accounts Receivable + References No definition available. + Details
Name: | fn_NumberOfMajorCustomersAccountingForTenPercentOrMoreOfTotalAccountsReceivable
Namespace Prefix: | fn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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