Fair Value (Details) - Assets measured at fair value on a non-recurring basis (USD $) In Thousands, unless otherwise specified	Jan. 31, 2014
Fair Value (Details) - Assets measured at fair value on a non-recurring basis [Line Items]
Property and equipment, net	$ 55	[1]
Fair Value, Inputs, Level 1 [Member]
Fair Value (Details) - Assets measured at fair value on a non-recurring basis [Line Items]
Property and equipment, net
Fair Value, Inputs, Level 2 [Member]
Fair Value (Details) - Assets measured at fair value on a non-recurring basis [Line Items]
Property and equipment, net
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	$ 521

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