Name:	us-gaap_BusinessAcquisitionLineItems
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Data Type:	xbrli:stringItemType
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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The cash outflow associated with the purchase of noncontrolling interest during the period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585

Name:	us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585

Name:	us-gaap_PaymentsToAcquireBusinessesGross
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Period Type:	duration

Additional ownership interest acquired in subsidiary.

No definition available.

Name:	wso_AdditionalOwnershipInterestAcquiredInSubsidiary
Namespace Prefix:	wso_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Additional ownership interest percentage acquired in joint venture.

No definition available.

Name:	wso_AdditionalOwnershipInterestPercentageAcquiredInJointVenture
Namespace Prefix:	wso_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

No Of Locations From where this enterprise carries out its operations.

No definition available.

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

Percentage of ownership interest in subsidiary.

No definition available.