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Acquisitions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 0 Months Ended | 3 Months Ended | 0 Months Ended
--- | --- | --- | --- | ---
Apr. 30, 2015 | Apr. 30, 2014 | May 01, 2014 | Oct. 31, 2013 | Apr. 30, 2014 | Aug. 30, 2013 | Jan. 05, 2015
Business Acquisition [Line Items] |  |  |  |  |  |  |
Payment to acquire business, net | $ 49,265 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | $ 33,683 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |  |  |  |  |
K.Z. Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Payment to acquire business |  |  | 53,405 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionThreeMember |  |  |  |
Asset purchase agreement date |  |  | May 01, 2014 |  |  |  |
Purchase price adjustment |  |  | 2,915 tho_BusinessAcquisitionPurchasePriceAdjustments / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionThreeMember |  |  |  |
Cash on hand at the acquisition date |  |  | 996 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionThreeMember |  |  |  |
Payment to acquire business, net |  |  | 55,324 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionThreeMember |  |  |  |
Amortizable intangible assets, weighted average useful life |  |  | 13 years 10 months 24 days |  |  |  |
Bison |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Payment to acquire business |  |  |  | 16,718 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionOneMember | 16,914 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionOneMember |  |
Asset purchase agreement date |  |  |  | Oct. 31, 2013 |  |  |
Amortizable intangible assets, weighted average useful life |  |  |  | 13 years 3 months 18 days |  |  |
Additional cash payment |  |  |  |  | 196 us-gaap_OtherPaymentsToAcquireBusinesses / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionOneMember |  |
Livin' Lite |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Asset purchase agreement date |  |  |  |  |  | Aug. 30, 2013 |
Cash on hand at the acquisition date |  |  |  |  |  | 247 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionTwoMember |
Payment to acquire business, net |  |  |  |  |  | 16,769 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionTwoMember |
Amortizable intangible assets, weighted average useful life |  |  |  |  |  | 10 years 2 months 12 days |
Cruiser RV, LLC and DRV, LLC |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Payment to acquire business |  |  |  |  |  |  | 47,412 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionFourMember
Asset purchase agreement date |  |  |  |  |  |  | Dec. 31, 2014
Purchase price adjustment | 1,073 tho_BusinessAcquisitionPurchasePriceAdjustments / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionFourMember |  |  |  |  |  |
Cash on hand at the acquisition date | 1,062 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionFourMember |  |  |  |  |  | 1,062 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionFourMember
Payment to acquire business, net | $ 46,350 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionFourMember |  |  |  |  |  | $ 47,423 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionFourMember
Amortizable intangible assets, weighted average useful life |  |  |  |  |  |  | 13 years 10 months 24 days
Dealer Networks |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets amortization period | 9 years |  | 12 years | 12 years |  | 8 years | 12 years
Amortizable intangible assets, amortization method | Accelerated cash flow basis |  |  |  |  |  |
Trademarks |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets amortization period | 20 years |  | 20 years | 20 years |  | 20 years | 20 years
Amortizable intangible assets, amortization method | Straight line basis |  |  |  |  |  |
Non-Compete Agreements |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets amortization period | 2 years |  | 5 years |  |  | 2 years |
Amortizable intangible assets, amortization method | Straight line basis |  |  |  |  |  |
Backlog |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets amortization period |  |  | 2 months | 42 days |  | 42 days | 42 days
Amortizable intangible assets, amortization method | Straight line basis |  |  |  |  |  |
Design Technology Assets |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets amortization period |  |  |  |  |  | 5 years |
Amortizable intangible assets, amortization method | Straight line basis |  |  |  |  |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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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 The amortization method of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar either by their nature or by their use in the operations of a company. The straight-line method is the preferred amortization method, unless another method better reflects the pattern in which the asset is consumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 35 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=26713198&loc=d3e15372-109273 + Details
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- Definition The cash outflow associated with other payments to acquire businesses including deposit on pending acquisitions and preacquisition costs. + 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 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + 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 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 + Details
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