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