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Basis of Presentation - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Blackhawk
Segment Reporting Information [Line Items]
Bonus and medical claim expenses	$ 1.6	$ 3.2

X

- Definition

Bonus and Medical Claim Expenses

+ References

No definition available.

+ Details

Name:	fi_BonusandMedicalClaimExpenses
Namespace Prefix:	fi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=fi_BlackhawkSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: