Revenues from External Customers and Long-Lived Assets, by Geographical Areas (Parenthetical) (Detail)	3 Months Ended
Aug. 31, 2013
Revenue from External Customer [Line Items]
Minimum percentage of revenue accounted for major customer	10.00%

Minimum percentage of revenue accounted for major customer.

No definition available.

Name:	elrc_MinimumPercentageOfRevenueAccountedForMajorCustomer
Namespace Prefix:	elrc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration