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Derivatives and Hedging Activities - Additional Information (Detail) | 12 Months Ended |  |  |  |  | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended |  |  |  |
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Jul. 31, 2014 USD ($) | Jul. 31, 2013 USD ($) | Jul. 31, 2012 USD ($) | Jul. 31, 2011 USD ($) | May 13, 2010 Senior Unsecured Notes [Member] USD ($) | Jul. 31, 2014 Foreign exchange contract [Member] USD ($) | Jul. 31, 2013 Foreign exchange contract [Member] USD ($) | Jul. 31, 2014 Not designated as hedging Instruments [Member] USD ($) | Jul. 31, 2013 Not designated as hedging Instruments [Member] USD ($) | Jul. 31, 2014 Net investment hedging [Member] USD ($) | Jul. 31, 2013 Net investment hedging [Member] USD ($) | Jul. 31, 2014 Designated as hedging instruments [Member] USD ($) | Jul. 31, 2013 Designated as hedging instruments [Member] USD ($) | Jul. 31, 2014 Designated as hedging instruments [Member] Net investment hedging [Member] GBP-denominated interco debt [Member] USD ($) | Jul. 31, 2013 Designated as hedging instruments [Member] Net investment hedging [Member] GBP-denominated interco debt [Member] USD ($) | Jul. 31, 2014 Designated as hedging instruments [Member] Net investment hedging [Member] GBP-denominated interco debt [Member] GBP (£) | Jul. 31, 2014 Designated as hedging instruments [Member] Net investment hedging [Member] EUR denominated unsecured debt [Domain] USD ($) | Jul. 31, 2013 Designated as hedging instruments [Member] Net investment hedging [Member] EUR denominated unsecured debt [Domain] USD ($) | Jul. 31, 2012 Designated as hedging instruments [Member] Net investment hedging [Member] EUR denominated unsecured debt [Domain] USD ($) | Jul. 31, 2013 Designated as hedging instruments [Member] Net investment hedging [Member] EUR denominated unsecured debt [Domain] EUR (€) | May 13, 2010 Designated as hedging instruments [Member] Net investment hedging [Member] EUR denominated unsecured debt [Domain] EUR (€) | Jul. 31, 2014 Designated as hedging instruments [Member] Cash Flow Hedging [Member] USD ($) | Jul. 31, 2013 Designated as hedging instruments [Member] Cash Flow Hedging [Member] USD ($) | Jul. 31, 2012 Designated as hedging instruments [Member] Cash Flow Hedging [Member] USD ($) | Jul. 31, 2014 Other current liabilities [Member] Not designated as hedging Instruments [Member] Foreign exchange contract [Member] USD ($) | Jul. 31, 2013 Other current liabilities [Member] Not designated as hedging Instruments [Member] Foreign exchange contract [Member] USD ($) | Jul. 31, 2014 Prepaid expenses and other current assets [Member] Not designated as hedging Instruments [Member] Foreign exchange contract [Member] USD ($) | Jul. 31, 2013 Prepaid expenses and other current assets [Member] Not designated as hedging Instruments [Member] Foreign exchange contract [Member] USD ($)
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative maturity | 18 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized losses on foreign currency cash flow hedges expected to be reclassified to earnings within the next twelve months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 21,000 | $ 118,000 |  |  |  |  |
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimate of Time to Transfer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 months |  |  |  |  |  |
Reclassification adjustment for (gains) losses included in net income | (147,000) | (578,000) | 494,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (147,000) | (578,000) | 494,000 |  |  |  |
Net investment hedges to hedge portions of net investment |  |  |  |  | 75,000,000.0 |  |  |  |  |  |  |  |  |  |  | 25,000,000 |  |  |  | (4,835,000) | 75,000,000 |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  | 104,000,000 | 157,500,000 |  |  | 5,300,000 | 4,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated other comprehensive income | 64,156,000 | 56,063,000 | 59,411,000 | 113,898,000 |  |  |  |  |  |  |  |  |  |  |  |  | (5,495,000) |  |  |  |  |  |  |  |  |  |  |
Foreign exchange contracts |  |  |  |  |  |  |  |  |  | 265,000 | (150,000) |  |  | 2,271,000 | 2,121,000 |  | (660,000) | (7,470,000) | 15,705,000 |  |  |  |  |  |  |  |  |
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments |  |  |  |  |  |  |  | 1,147,000 | (1,594,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  |  |  |  |  |  |  | 375,000 | 890,000 |  |  | 100,424,000 | 99,750,000 |  |  |  |  |  |  |  |  |  |  |  | 375,000 | 890,000 |  |
Asset Derivatives |  |  |  |  |  |  |  | $ 166,000 | $ 287,000 |  |  | $ 0 | $ 7,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 166,000 | $ 287,000

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e681-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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- Definition The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80748-113994 + Details
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