Acquisitions - Additional Information (Detail) (USD $)			1 Months Ended	3 Months Ended	6 Months Ended	1 Months Ended
	Oct. 31, 2013	Apr. 30, 2013	Aug. 14, 2013 Taylor Manufacturing Systems, USA, LLC	Oct. 31, 2013 Taylor Manufacturing Systems, USA, LLC	Oct. 31, 2013 Taylor Manufacturing Systems, USA, LLC	Aug. 14, 2013 Taylor Manufacturing Systems, USA, LLC Current Technology
Business Acquisition [Line Items]
Business acquisition, purchase price			$ 1,841,000
Business acquisition, purchase price paid in cash			1,191,000
Business acquisition, additional cash payments payable in each of three years following closing			200,000
Current Liabilities			213,000
Long Term liabilities			366,000
Business acquisition costs incurred				68,500	68,500
Goodwill	$ 13,819,000	$ 12,601,000	$ 1,218,000
Remaining estimated economic life of product						4 years