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Operating Lease and Asset Retirement Obligations - Asset Retirement Obligations (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Asset Retirement Obligations [Line Items]
Beginning asset retirement obligation	$ 1,835	$ 1,667	$ 1,498
Liabilities incurred during year		63	71
Liabilities settled during year
Accretion expense	75	105	98
Liability transferred upon sale of business	(1,910)
Ending asset retirement obligation		$ 1,835	$ 1,667

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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- Definition

Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

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