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Basic and Diluted Earnings Per Share - Additional Information (Detail) In Millions, unless otherwise specified | 3 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items] |  |
Stock options included in the computation of diluted shares outstanding | 1 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 2 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Stock Options | Maximum |  |
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items] |  |
Stock options excluded from computation of average dilutive shares outstanding | 1 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 1 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Class B common stock |  |
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items] |  |
Weighted-average as-converted class B common stock used in income allocation | 101 v_WeightedAverageNumberSharesOutstandingAsConvertedBasis / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 103 v_WeightedAverageNumberSharesOutstandingAsConvertedBasis / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + Details
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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 28A -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1500-109256 + Details
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- Details
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- Definition Weighted Average Number Shares Outstanding, As-Converted Basis + References No definition available. + Details
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- Details
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- Details
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