Intangible Assets Including Acquisition-Related Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
Finite-Lived Intangible Assets [Line Items]
Beginning Balance	$ 534	$ 687
Amortization expense	(976)	(625)
Ending Balance	2,748	534
Taylor Manufacturing Systems, USA, LLC
Finite-Lived Intangible Assets [Line Items]
Intangibles related to the Acquisition		472
MID Retail, Inc.
Finite-Lived Intangible Assets [Line Items]
Intangibles related to the Acquisition	3,190
Supply Chain Management
Finite-Lived Intangible Assets [Line Items]
Beginning Balance	534	687
Amortization expense	(976)	(625)
Ending Balance	2,748	534
Supply Chain Management | Taylor Manufacturing Systems, USA, LLC
Finite-Lived Intangible Assets [Line Items]
Intangibles related to the Acquisition		$ 472
Supply Chain Management | MID Retail, Inc.
Finite-Lived Intangible Assets [Line Items]
Intangibles related to the Acquisition	$ 3,190