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Fair Value Measures - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Apr. 30, 2015 | Apr. 30, 2014 | Apr. 30, 2015 | Apr. 30, 2014 | Oct. 31, 2014
Fair Value Measures [Line Items] |  |  |  |  |
Other-than-temporary impairment | $ 0 us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment | $ 0 us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment | $ 0 us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment | $ 0 us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment |
Non-marketable equity securities | 10.9 us-gaap_SecuritiesOwnedNotReadilyMarketable |  | 10.9 us-gaap_SecuritiesOwnedNotReadilyMarketable |  | 10.9 us-gaap_SecuritiesOwnedNotReadilyMarketable
Cost Method Investments |  |  |  |  |
Fair Value Measures [Line Items] |  |  |  |  |
Non-marketable equity securities | 6.7 us-gaap_SecuritiesOwnedNotReadilyMarketable / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CostmethodInvestmentsMember |  | 6.7 us-gaap_SecuritiesOwnedNotReadilyMarketable / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CostmethodInvestmentsMember |  | 6.7 us-gaap_SecuritiesOwnedNotReadilyMarketable / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CostmethodInvestmentsMember
Equity Method Investments |  |  |  |  |
Fair Value Measures [Line Items] |  |  |  |  |
Non-marketable equity securities | $ 4.2 us-gaap_SecuritiesOwnedNotReadilyMarketable / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_EquityMethodInvestmentsMember |  | $ 4.2 us-gaap_SecuritiesOwnedNotReadilyMarketable / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_EquityMethodInvestmentsMember |  | $ 4.2 us-gaap_SecuritiesOwnedNotReadilyMarketable / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_EquityMethodInvestmentsMember

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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the cost method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596 + Details
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- Definition Aggregate carrying value of owned private equity or other securities for which a quoted market price is not readily determinable, the value of which has been determined by management based upon fair value methods, including pricing of similar securities and valuation techniques and is included in the schedule of financial condition or the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Rule 15c3 -Number 240 -Section 3 -Paragraph i -Article 15c3 + Details
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