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Significant Accounting Policies - EPS (Details) - shares	Sep. 30, 2019	Sep. 30, 2018
Significant Accounting Policies
Common stock equivalents (in shares)	0	0

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- Definition

Common stock equivalents.

+ References

No definition available.

+ Details

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Namespace Prefix:	joe_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

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