General (Details) Households in Millions	Apr. 30, 2016 Households
General [Abstract]
Household Broadcast Penetration, Number of Households Period End	88

Household Broadcast Penetration, Number of Households Period End

No definition available.

Name:	evlv_HouseholdBroadcastPenetrationNumberofHouseholdsPeriodEnd
Namespace Prefix:	evlv_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant