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Summary of Significant Accounting Policies (Narrative) (Details) | 3 Months Ended
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Apr. 30, 2013
Debt Instrument, Year of Maturity | 2019

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- Definition Debt Instrument, Year of Maturity + References No definition available. + Details
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Namespace Prefix: | mtn_
Data Type: | us-types:dateStringItemType
Balance Type: | na
Period Type: | duration