v3.8.0.1

Subsequent event - Additional Information (Detail) - USD ($) $ in Millions	Feb. 28, 2018	Aug. 31, 2017
Subsequent Event [Line Items]
Amount of repurchased ordinary shares		$ 30.0
Subsequent Event
Subsequent Event [Line Items]
Additional amount of repurchased ordinary shares	$ 30.0
Amount of repurchased ordinary shares	$ 60.0

X

- Definition

Share Repurchase Program Additional Authorized Amount

+ References

No definition available.

+ Details

Name:	fn_ShareRepurchaseProgramAdditionalAuthorizedAmount
Namespace Prefix:	fn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: