At-the-market Equity Offering Program, Common Stock Available for Issuance

No definition available.

Name:	for_AtTheMarketEquityOfferingProgramCommonStockAvailableForIssuance
Namespace Prefix:	for_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

At-the-market Equity Offering Program, Common Stock Issued

+ References

No definition available.

+ Details

Name:	for_AtTheMarketEquityOfferingProgramCommonStockIssued
Namespace Prefix:	for_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

At-the-market Equity Offering Program, Net Proceeds

+ References

No definition available.

+ Details

Name:	for_AtTheMarketEquityOfferingProgramNetProceeds
Namespace Prefix:	for_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Common Stock Available for Issuance, Value Remaining

+ References

No definition available.

+ Details

Name:	for_CommonStockAvailableforIssuanceValueRemaining
Namespace Prefix:	for_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The dollar amount of equity securities registered under the entity's registration statement.

+ References

No definition available.

+ Details

Name:	for_EquitySecuritiesRegisteredValue
Namespace Prefix:	for_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of decrease in additional paid in capital (APIC) resulting from direct costs associated with issuing stock. Includes, but is not limited to, legal and accounting fees and direct costs associated with stock issues under a shelf registration.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21463-112644

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

+ Details

Name:	us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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_ClassOfStockLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of noncash expense for share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Stockholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended
Stockholders' Equity (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Nov. 18, 2021	Oct. 08, 2021
Class of Stock [Line Items]
Equity Securities Registered, Value				$ 750.0
At-the-market Equity Offering Program, Common Stock Available for Issuance	$ 298.2		$ 300.0
At-the-market Equity Offering Program, Common Stock Issued	84,547
At-the-market Equity Offering Program, Net Proceeds	$ 1.7
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs	0.1
Common Stock Available for Issuance, Value Remaining	$ 748.2
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	0
Stock-based compensation expense	$ 0.4	$ 0.3