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Subsequent Events - Additional Information (Details) (Verold Inc, Subsequent Event, USD $)
In Millions, unless otherwise specified
1 Months Ended
May 31, 2015
Verold Inc | Subsequent Event
 
Subsequent Event [Line Items]  
Business acquisition, Purchase price paid in stock $ 5.4us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ us-gaap_BusinessAcquisitionAxis
= box_VeroldIncMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember