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Schedule of Segment Reporting Information, by Segment Balance Sheet Item (Detail) (USD $) In Thousands, unless otherwise specified | Apr. 30, 2015 | Jul. 31, 2014
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Segment Reporting Information [Line Items] |  |
Total assets | $ 1,550,262 us-gaap_Assets | $ 1,408,718 us-gaap_Assets
Continuing Operations | Recreation Vehicles |  |
Segment Reporting Information [Line Items] |  |
Total assets | 1,202,689 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = tho_RecreationVehiclesMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember | 1,038,268 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = tho_RecreationVehiclesMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember
Continuing Operations | Recreation Vehicles | Towables |  |
Segment Reporting Information [Line Items] |  |
Total assets | 995,488 us-gaap_Assets / us-gaap_ProductOrServiceAxis = tho_TowablesMember / us-gaap_StatementBusinessSegmentsAxis = tho_RecreationVehiclesMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember | 868,017 us-gaap_Assets / us-gaap_ProductOrServiceAxis = tho_TowablesMember / us-gaap_StatementBusinessSegmentsAxis = tho_RecreationVehiclesMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember
Continuing Operations | Recreation Vehicles | Motorized |  |
Segment Reporting Information [Line Items] |  |
Total assets | 207,201 us-gaap_Assets / us-gaap_ProductOrServiceAxis = tho_MotorizedMember / us-gaap_StatementBusinessSegmentsAxis = tho_RecreationVehiclesMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember | 170,251 us-gaap_Assets / us-gaap_ProductOrServiceAxis = tho_MotorizedMember / us-gaap_StatementBusinessSegmentsAxis = tho_RecreationVehiclesMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember
Continuing Operations | Corporate |  |
Segment Reporting Information [Line Items] |  |
Total assets | $ 347,573 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember | $ 370,450 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 + Details
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Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |