Fair Value (Detail) - Assets measured at fair value on a non-recurring basis (USD $) In Thousands, unless otherwise specified	Oct. 31, 2012 Assets Measured At Fair Value On A Non-recurring Basis Subsequent [Member] Fair Value, Inputs, Level 3 [Member]	Oct. 31, 2012 Assets Measured At Fair Value On A Non-recurring Basis Subsequent [Member]		Jan. 31, 2012 Assets Measured At Fair Value On A Non-recurring Basis Over Various Dates [Member] Fair Value, Inputs, Level 3 [Member]	Jan. 31, 2012 Assets Measured At Fair Value On A Non-recurring Basis Over Various Dates [Member]
Property and equipment, net	$ 1,364	$ 307	[1]	$ 8,803	$ 1,227	[1]

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