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The amount of identifiable intangible assets recognized as of the acquisition date.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Allocation of Total Purchase Price (Detail) (USD $) In Thousands, unless otherwise specified	0 Months Ended
	Aug. 14, 2013	May 30, 2014	Jan. 31, 2015	Apr. 30, 2014
Business Acquisition [Line Items]
Goodwill			$ 18,749us-gaap_Goodwill	$ 13,819us-gaap_Goodwill
Taylor Manufacturing Systems, USA, LLC
Business Acquisition [Line Items]
Current Assets	130
Goodwill	1,218
Total Assets Acquired	1,820
Current Liabilities	(213)
Long-term liabilities	(366)
Net assets acquired	1,241
Taylor Manufacturing Systems, USA, LLC \| Current Technology
Business Acquisition [Line Items]
Intangible assets	472
Useful Life	4 years
MID Retail, Inc.
Business Acquisition [Line Items]
Current Assets		1,858
Property and equipment, net		32
Other assets		505
Goodwill		4,930
Total Assets Acquired		10,515
Current Liabilities		(825)
Long-term liabilities		(505)
Total liabilities assumed		(1,330)
Net assets acquired		9,185
MID Retail, Inc. \| Current Technology
Business Acquisition [Line Items]
Intangible assets		1,500
Useful Life		3 years
MID Retail, Inc. \| Non-compete
Business Acquisition [Line Items]
Intangible assets		290
Useful Life		3 years
MID Retail, Inc. \| Customer Relationships
Business Acquisition [Line Items]
Intangible assets		$ 1,400
Useful Life		8 years