Acquisitions - Additional Information (Detail) - USD ($)			3 Months Ended	6 Months Ended	12 Months Ended
	May. 30, 2014	Aug. 14, 2013	Oct. 31, 2013	Oct. 31, 2013	Apr. 30, 2015	Jan. 31, 2015	Apr. 30, 2014	Apr. 30, 2013
Business Acquisition [Line Items]
Business acquisition, purchase price allocate to goodwill					$ 18,749,000		$ 13,819,000	$ 12,601,000
MID Retail, Inc.
Business Acquisition [Line Items]
Percentage of issued and outstanding shares of capital stock	100.00%
Business acquisition, purchase price paid in cash	$ 8,507,000
Business acquisition, working capital adjustment	$ 678,000
Earnout period	24 months
Additional consideration payments, percentage of license fee revenues	15.00%
Additional consideration payments	$ 1,500,000
Business acquisition costs incurred					$ 282,000
Business acquisition, purchase price allocate to goodwill	4,930,000
MID Retail, Inc. | License Revenue
Business Acquisition [Line Items]
Revenues included in the consolidated financial statements since date of acquisition	1,761,000
MID Retail, Inc. | Services and other revenues
Business Acquisition [Line Items]
Revenues included in the consolidated financial statements since date of acquisition	725,000
MID Retail, Inc. | Maintenance revenues
Business Acquisition [Line Items]
Revenues included in the consolidated financial statements since date of acquisition	$ 1,160,000
MID Retail, Inc. | Current Technology
Business Acquisition [Line Items]
Intangible assets amortized period	3 years
Taylor Manufacturing Systems, USA, LLC
Business Acquisition [Line Items]
Business acquisition, purchase price paid in cash		$ 1,191,000
Business acquisition costs incurred			$ 68,500	$ 68,500
Business acquisition, purchase price allocate to goodwill		1,218,000
Business acquisition, purchase price		1,841,000
Business acquisition, additional cash payments payable in each of three years following closing		200,000
Business acquisition, additional cash payments payable in first anniversary		200,000
Business acquisition, additional cash payments payable in second and third anniversaries		$ 366,000
Business acquisition, cash payments payable in second anniversary						$ 200,000
Business acquisition, cash payments payable in third anniversaries						$ 183,000
Taylor Manufacturing Systems, USA, LLC | Current Technology
Business Acquisition [Line Items]
Intangible assets amortized period		4 years