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Earnings Per Share - Additional Information (Detail) (Class B Common Stock)	Mar. 31, 2013	Mar. 31, 2012
Class B Common Stock
Earnings Per Share, Convertible Stock Outstanding, Including Two Class Method [Line Items]
Convertible Class B common stock outstanding	2,705,465	2,846,334

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- Definition

Convertible class B common stock outstanding

+ 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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- Details

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