Subsequent Event - Additional Information (Detail) (Subsequent Event, Asset Purchase Agreement, USD $) In Thousands, unless otherwise specified	Sep. 17, 2012
Subsequent Event \| Asset Purchase Agreement
Subsequent Event [Line Items]
Acquisition of Krystal's bus operation assets for cash consideration	$ 3,900

Amount of expected cash payments resulting from acquisition.

No definition available.

Name:	tho_AmountOfExpectedCashPaymentsResultingFromAcquisition
Namespace Prefix:	tho_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant