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Earnings Per Share - Additional Information (Detail) - shares | Sep. 30, 2020 | Sep. 30, 2019
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Earnings Per Share [Line Items] |  |
Class B common stock conversion, number of shares | 2,576,570 | 2,576,336

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- Definition Class B common stock securities that may be converted to Common stock securities at any time on a one-for-one basis at the option of the shareholder. + References No definition available. + Details
Name: | wso_ConvertibleClassBCommonStockOutstanding
Namespace Prefix: | wso_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Earnings per share disclosures. + References No definition available. + Details
Name: | wso_EarningsPerShareLineItems
Namespace Prefix: | wso_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration