Revenue - Additional Information (Detail1) - Pharma Research and Development Services [Member] $ in Millions	6 Months Ended
Jun. 30, 2018 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: (nil)
Disaggregation Of Revenue [Line Items]
Remaining transaction price allocated to performance obligations expected to be recognized	$ 138.6
Related Parties \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2018-04-01
Disaggregation Of Revenue [Line Items]
Remaining transaction price allocated to performance obligations expected to be recognized period	1 year
Percentage of remaining transaction price allocated to performance obligations expected to be recognized	64.00%
Related Parties \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-04-01
Disaggregation Of Revenue [Line Items]
Remaining transaction price allocated to performance obligations expected to be recognized period	1 year
Percentage of remaining transaction price allocated to performance obligations expected to be recognized	34.00%
Related Parties \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: (nil)
Disaggregation Of Revenue [Line Items]
Remaining transaction price allocated to performance obligations expected to be recognized	$ 57.4
Third Party [Member] \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2018-04-01
Disaggregation Of Revenue [Line Items]
Remaining transaction price allocated to performance obligations expected to be recognized period	1 year
Percentage of remaining transaction price allocated to performance obligations expected to be recognized	39.00%
Third Party [Member] \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-04-01
Disaggregation Of Revenue [Line Items]
Remaining transaction price allocated to performance obligations expected to be recognized period	1 year
Percentage of remaining transaction price allocated to performance obligations expected to be recognized	26.00%
Third Party [Member] \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-04-01
Disaggregation Of Revenue [Line Items]
Remaining transaction price allocated to performance obligations expected to be recognized period	1 year
Percentage of remaining transaction price allocated to performance obligations expected to be recognized	35.00%
Third Party [Member] \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: (nil)
Disaggregation Of Revenue [Line Items]
Remaining transaction price allocated to performance obligations expected to be recognized	$ 81.2

Revenue remaining performance obligation expected timing of satisfaction percentage.

No definition available.

Name:	fmi_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPercentage
Namespace Prefix:	fmi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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

- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130556-203045

+ Details

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

- Definition

Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130556-203045

+ Details

Name:	us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	srt_ProductOrServiceAxis=fmi_PharmaResearchAndDevelopmentServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis=None
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=fmi_RelatedPartiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis=2018-04-01
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis=2019-04-01
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=fmi_ThirdPartyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis=2020-04-01
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: