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Acquisitions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 0 Months Ended | 3 Months Ended | 0 Months Ended
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Jan. 31, 2015 | Jan. 31, 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 | $ 33,487 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 |  |  |  |
Amortizable intangible assets, weighted average useful life |  |  | 13 years 10 months 24 days |  |  |  |
Purchase price adjustment |  |  | 2,915 tho_BusinessAcquisitionPurchasePriceAdjustments / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionThreeMember |  |  |  |
Payment to acquire business, net |  |  | 55,324 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionThreeMember |  |  |  |
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 |
Amortizable intangible assets, weighted average useful life |  |  |  |  |  | 10 years 2 months 12 days |
Payment to acquire business, net |  |  |  |  |  | 16,769 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionTwoMember |
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
Amortizable intangible assets, weighted average useful life |  |  |  |  |  |  | 13 years 10 months 24 days
Payment to acquire business, net |  |  |  |  |  |  | $ 46,350 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionFourMember
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 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=31042434&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=31042434&loc=d3e3213-108585 + Details
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