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Subsidiary Guarantors - Additional Information (Detail) (Guarantors [Member]) | Jul. 31, 2013
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Guarantors [Member] |
Condensed Financial Statements, Captions [Line Items] |
Ownership percentage by parent | 100.00%

X
- Details
Name: | us-gaap_CondensedFinancialStatementsCaptionsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
Name: | us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant