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Summary of Final 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 | Aug. 30, 2013 | May 01, 2014 | Jul. 31, 2014 | Oct. 31, 2013
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 |  |  |  |
Bison |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Current assets |  |  |  |  |  | 4,050 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionOneMember
Property, plant and equipment |  |  |  |  |  | 625 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionOneMember
Goodwill |  |  |  |  |  | 6,660 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionOneMember
Current liabilities |  |  |  |  |  | (3,761)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionOneMember
Total fair value of net assets acquired |  |  |  |  |  | 16,914 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionOneMember
Bison | Dealer Networks |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition allocated to amortizing intangible asset |  |  |  |  |  | 7,400 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionOneMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = tho_DealerNetworkMember
Bison | Trademarks |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition allocated to amortizing intangible asset |  |  |  |  |  | 1,800 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionOneMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember
Bison | Backlog |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition allocated to amortizing intangible asset |  |  |  |  |  | 140 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionOneMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = tho_BacklogMember
Livin' Lite |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash |  |  | 247 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionTwoMember |  |  |
Other current assets |  |  | 3,626 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionTwoMember |  |  |
Property, plant and equipment |  |  | 137 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionTwoMember |  |  |
Goodwill |  |  | 9,113 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionTwoMember |  |  |
Current liabilities |  |  | (2,147)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionTwoMember |  |  |
Total fair value of net assets acquired |  |  | 17,016 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionTwoMember |  |  |
Less cash acquired |  |  | (247)us-gaap_CashAcquiredFromAcquisition / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionTwoMember |  |  |
Total cash consideration for acquisition, less cash acquired |  |  | 16,769 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionTwoMember |  |  |
Livin' Lite | Dealer Networks |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition allocated to amortizing intangible asset |  |  | 3,200 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionTwoMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = tho_DealerNetworkMember |  |  |
Livin' Lite | Trademarks |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition allocated to amortizing intangible asset |  |  | 1,500 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionTwoMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |  |  |
Livin' Lite | Backlog |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition allocated to amortizing intangible asset |  |  | 110 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionTwoMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = tho_BacklogMember |  |  |
Livin' Lite | Design Technology Assets |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition allocated to amortizing intangible asset |  |  | 1,100 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionTwoMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = tho_DesignTechnologyAssetsMember |  |  |
Livin' Lite | Non-Compete Agreements |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition allocated to amortizing intangible asset |  |  | 130 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionTwoMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |  |  |
K.Z. Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash |  |  |  | 996 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionThreeMember |  |
Other current assets |  |  |  | 34,121 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionThreeMember |  |
Property, plant and equipment |  |  |  | 15,057 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionThreeMember |  |
Goodwill |  |  |  | 2,703 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionThreeMember |  |
Current liabilities |  |  |  | (16,127)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionThreeMember |  |
Total fair value of net assets acquired |  |  |  | 56,320 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionThreeMember |  |
Less cash acquired |  |  |  | (996)us-gaap_CashAcquiredFromAcquisition / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionThreeMember |  |
Total cash consideration for acquisition, less cash acquired |  |  |  | 55,324 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionThreeMember |  |
K.Z. Inc. | Dealer Networks |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition allocated to amortizing intangible asset |  |  |  | 13,160 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionThreeMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = tho_DealerNetworkMember |  |
K.Z. Inc. | Trademarks |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition allocated to amortizing intangible asset |  |  |  | 5,540 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionThreeMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |  |
K.Z. Inc. | Backlog |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition allocated to amortizing intangible asset |  |  |  | 420 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionThreeMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = tho_BacklogMember |  |
K.Z. Inc. | Non-Compete Agreements |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition allocated to amortizing intangible asset |  |  |  | $ 450 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionThreeMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |  |

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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 other assets expected to be realized or consumed before one year or the normal operating cycle, if longer, 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 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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