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Inventories - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | Apr. 30, 2015 | Jul. 31, 2014
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Inventory [Line Items] |  |
Inventory | $ 286,429 us-gaap_InventoryGross | $ 244,342 us-gaap_InventoryGross
Subsidiaries valued inventory in first-in, first-out method | $ 55,826 us-gaap_FIFOInventoryAmount | $ 36,096 us-gaap_FIFOInventoryAmount

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- Definition The amount of FIFO (first in first out) inventory present at the reporting date when inventory is also valued using different valuation methods. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 + Details
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Balance Type: | debit
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- Definition Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. + References Reference 1: 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Period Type: | duration