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Earnings Per Share (Narrative) (Details) (Class B Common Stock [Member])	Jun. 30, 2011	Jun. 30, 2010
Class B Common Stock [Member]
Conversion of stock into common stock, shares convertible	2,854,093	2,866,881

X

- Definition

Convertible Class B common stock outstanding.

+ Details

Name:	wso_ConvertibleClassBCommonStockOutstanding
Namespace Prefix:	wso
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant