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Business Acquisitions (Schedule of Purchase Price Allocation to Net Assets Acquired) (Detail) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2013		Jan. 31, 2012
Business Acquisition [Line Items]
Equipment	$ 9,403	[1]	$ 605
Goodwill	14,575	[1]	569
Intangible assets	9,601	[1]	1,136
Current assets	1,475	[1]
Current liabilities	(7,118)	[1]	(26)
Total	$ 27,936	[1]	$ 2,284
[1] The purchase price allocated to net assets acquired and the residual amount allocated to goodwill associated with the BBI acquisition has not been finalized and is provisional in nature. Management's estimates and assumptions are subject to change upon finalization of the valuation and may be adjusted in accordance with ASC 805.

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The amount of acquisition cost of a business combination allocated to an identifiable intangible asset that will be amortized.

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The total purchase price of the acquired entity. This includes cash paid to equity interest holders of the acquired entity, fair value of debt and equity securities issued to equity holders of the acquired entity, and transaction costs paid to third parties to consummate the acquisition.

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The amount of acquisition cost of a business combination allocated to current assets.

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The amount of acquisition cost of a business combination allocated to current liabilities of the acquired entity.

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The amount of acquisition cost of a business combination allocated to equipment used in the normal course of business, not including equipment that is held-for-sale.

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Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.

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