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Summary of Fair Value Assigned to Net Assets Acquired (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 0 Months Ended |
--- | --- | --- | ---
Apr. 30, 2015 | Apr. 30, 2014 | Jan. 05, 2015 | Jul. 31, 2014
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 269,651 us-gaap_Goodwill |  |  | $ 256,579 us-gaap_Goodwill
Total cash consideration for acquisition, less cash acquired | 49,265 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | 33,683 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |  |
Cruiser RV, LLC and DRV, LLC |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash | 1,062 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionFourMember |  | 1,062 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionFourMember |
Other current assets |  |  | 22,175 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionFourMember |
Property, plant and equipment |  |  | 4,533 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionFourMember |
Goodwill |  |  | 13,072 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionFourMember |
Current liabilities |  |  | (12,507)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionFourMember |
Total fair value of net assets acquired |  |  | 48,485 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionFourMember |
Less cash acquired |  |  | (1,062)us-gaap_CashAcquiredFromAcquisition / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionFourMember |
Total cash consideration for acquisition, less cash acquired | 46,350 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionFourMember |  | 47,423 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionFourMember |
Cruiser RV, LLC and DRV, LLC | Dealer Networks |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business acquisition allocated to amortizing intangible asset |  |  | 14,300 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionFourMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = tho_DealerNetworkMember |
Cruiser RV, LLC and DRV, LLC | Trademarks |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business acquisition allocated to amortizing intangible asset |  |  | 5,400 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionFourMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |
Cruiser RV, LLC and DRV, LLC | Backlog |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business acquisition allocated to amortizing intangible asset |  |  | $ 450 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionFourMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = tho_BacklogMember |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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- Definition Amount of liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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