v3.21.1

Intangibles - Weighted-average remaining life of intangible assets (Detail) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 26, 2021 | Jun. 26, 2020
Global CEM Solutions, Ltd. | Customer relationships |  |
Finite-Lived Intangible Liabilities [Line Items] |  |
Weighted average remaining life of acquired intangible assets | 4 years 1 month 6 days | 4 years 7 months 6 days

X
- Definition Finite-Lived Intangible Liabilities [Line Items] + References No definition available. + Details
Name: | fn_FiniteLivedIntangibleLiabilitiesLineItems
Namespace Prefix: | fn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
Name: | us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=fn_GlobalCemSolutionsLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_CustomerRelationshipsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |