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2414407 - Disclosure - Income Taxes (Summary of Reconciliation of Gross Unrecognized Tax Benefit) (Detail)
(http://www.workday.com/role/IncomeTaxesSummaryOfReconciliationOfGrossUnrecognizedTaxBenefitDetail)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001327811 (http://www.sec.gov/CIK)
Income Tax Disclosure [Abstract]Period [Axis]
2016-02-01 - 2017-01-31
2015-02-01 - 2016-01-31
2014-02-01 - 2015-01-31
Income Tax Disclosure [Abstract]
 
 
 
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
 
 
 
Unrecognized tax benefits at the beginning of the period
98,460,000  
88,663,000  
77,090,000  
Additions for tax positions taken in prior years
3,981,000  
2,818,000  
3,946,000  
Reductions for tax positions taken in prior years
0  
(881,000) 
(49,000) 
Additions for tax positions related to the current year
14,475,000  
9,144,000  
7,676,000  
Reductions related to a lapse of applicable statute of limitations
(115,000) 
(1,284,000) 
0  
Unrecognized tax benefits at the end of the period
116,801,000  
 
98,460,000  
 
88,663,000