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Basis of Presentation - Additional Information (Detail)	Sep. 30, 2015 Entity
Significant Accounting Policies [Line Items]
Number of joint ventures	3

X

- Definition

Number of joint ventures. Joint ventures are entities operated by the controlling interest for the mutual benefit of the members.

+ References

No definition available.

+ Details

Name:	wso_NumberOfJointVentures
Namespace Prefix:	wso_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Significant Accounting Policies [Line Items]

+ References

No definition available.

+ Details

Name:	wso_SignificantAccountingPoliciesLineItems
Namespace Prefix:	wso_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration