Summary of Estimated Fair Values of Separately Identifiable Assets Acquired and Liabilities Assumed (Detail) (USD $)	Oct. 31, 2013	Jul. 31, 2013	Mar. 02, 2013 Ultrasonix		Mar. 02, 2013 Ultrasonix Developed Technology	Mar. 02, 2013 Ultrasonix Customer Relationships	Mar. 02, 2013 Ultrasonix Trade Names	Oct. 31, 2013 PocketSonics	Sep. 20, 2013 PocketSonics	Sep. 20, 2013 PocketSonics In Process Research And Development
Business Acquisition [Line Items]
Cash			$ 400,000						$ 500,000
Goodwill	56,978,000	50,073,000	48,200,000					2,800,000	6,900,000
Intangible assets			25,300,000		5,900,000	18,500,000	900,000			11,500,000
Total assets acquired			93,100,000						18,900,000
Accounts payable and accrued expenses			(5,400,000)						(300,000)
Deferred taxes			(4,700,000)						(4,100,000)
Total liabilities assumed			(12,800,000)						(4,400,000)
Total purchase price			80,300,000						14,500,000
Accounts receivable			6,500,000	[1]
Inventory			9,400,000	[2]
Prepaids and other assets			2,900,000
Property, plant, and equipment			300,000
Other assets			100,000
Deferred revenue			(800,000)	[2]
Accrued warranty			(1,100,000)
Debt			$ (800,000)

[1] The gross amount due is $8.7 million, of which $2.2 million is expected to be uncollectible. We did not acquire any other class of receivables other than trade receivables as a result of the acquisition of Ultrasonix.

[2] The inventory fair value adjustment of $3.7 million associated with the acquisition was fully amortized as of October 31, 2013. The deferred revenue adjustment of $0.8 million associated with the acquisition will be amortized over 4.5 years. The inventory fair value and deferred revenue adjustments were recognized in product cost of sales and product revenue in our condensed consolidated statement of operations, respectively.