Fair Value (Details) - Assets measured at fair value on a non-recurring basis (USD $) In Thousands, unless otherwise specified	Apr. 30, 2015
Fair Value (Details) - Assets measured at fair value on a non-recurring basis [Line Items]
Property and equipment, net	$ 216	[1]
Fair Value, Inputs, Level 3 [Member]
Fair Value (Details) - Assets measured at fair value on a non-recurring basis [Line Items]
Property and equipment, net	$ 522

[1] Total losses include impairment charges and loss on disposal.