Nature Of Operations And Accounting Policies (Details) (Minimum [Member])	1 Months Ended
Sep. 30, 2011
Minimum [Member]
Percentage used to determine whether it is more likely than not that a reporting unit's fair value is less than its carrying amount	50.00%

Percentage used to determine whether it is more likely than not that a reporting units fair value is less than its carrying amount.

No definition available.

Name:	tho_PercentageUsedToDetermineWhetherItIsMoreLikelyThanNotThatReportingUnitFairValueIsLessThanItsCarryingAmount
Namespace Prefix:	tho_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration