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Summary of Preliminary 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 | May 01, 2015
Business Acquisition [Line Items] |  |  |
Total preliminary cash consideration for acquisition, less cash acquired | $ 49,265 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | $ 33,683 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |
Subsequent Event | Postle Operating, LLC |  |  |
Business Acquisition [Line Items] |  |  |
Cash |  |  | 1,639 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionFiveMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Accounts receivable |  |  | 23,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionFiveMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Inventories |  |  | 34,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionFiveMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Property, plant and equipment |  |  | 26,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionFiveMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Other assets |  |  | 500 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionFiveMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Goodwill and intangible assets |  |  | 91,315 us-gaap_IntangibleAssetsNetIncludingGoodwill / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionFiveMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Current liabilities |  |  | (26,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionFiveMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Capital lease obligations |  |  | (4,500)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCapitalLeaseObligation / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionFiveMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Total preliminary approximation of net assets acquired |  |  | 145,954 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionFiveMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Less cash acquired |  |  | (1,639)us-gaap_CashAcquiredFromAcquisition / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionFiveMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Total preliminary cash consideration for acquisition, less cash acquired |  |  | $ 144,315 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = tho_BusinessAcquisitionFiveMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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- Definition Amount of capital lease obligation, 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 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 due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within 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 The amount of inventory 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 Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + 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 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 Carrying amount of finite-lived intangible assets, indefinite-lived intangible assets and goodwill. Goodwill is an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Intangible assets are assets, not including financial assets, lacking physical substance. + References No definition available. + Details
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