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Earnings Per Share - Additional Information (Detail) - shares	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Line Items]
Convertible Class B common stock outstanding	2,709,194	2,716,320

X

- 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

X

- 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