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Schedule of Major Classifications of Inventories (Detail) (USD $) In Thousands, unless otherwise specified | Jan. 31, 2015 | Jul. 31, 2014
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Inventory [Line Items] |  |
Raw materials | $ 131,915 us-gaap_InventoryRawMaterials | $ 122,150 us-gaap_InventoryRawMaterials
Chassis | 51,947 tho_InventoryChassis | 45,231 tho_InventoryChassis
Work in process | 51,411 us-gaap_InventoryWorkInProcess | 49,537 us-gaap_InventoryWorkInProcess
Finished goods | 38,067 us-gaap_InventoryFinishedGoods | 27,424 us-gaap_InventoryFinishedGoods
Total | 273,340 us-gaap_InventoryGross | 244,342 us-gaap_InventoryGross
Excess of FIFO costs over LIFO costs | (28,923)us-gaap_ExcessOfReplacementOrCurrentCostsOverStatedLIFOValue | (27,988)us-gaap_ExcessOfReplacementOrCurrentCostsOverStatedLIFOValue
Total inventories | $ 244,417 us-gaap_InventoryNet | $ 216,354 us-gaap_InventoryNet

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- Definition Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 6 -Subparagraph a -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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