Contingent Liabilities and Commitments - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended							3 Months Ended			12 Months Ended
	Jan. 27, 2012	May 31, 2012	May 31, 2011	May 31, 2010	May 31, 2012 Steel Processing Facility Facility	May 31, 2012 Product Returns	Nov. 30, 2011 Product Returns	May 31, 2011 Product Returns	Nov. 30, 2011 Recall-Related Costs	May 31, 2011 Recall-Related Costs	Jul. 01, 2011 Bernz	May 31, 2012 Coleman Cylinders Minimum
Commitments and Contingencies [Line Items]
Damages awarded to the plaintiff	$ 3,700,000
Loss related to litigation settlement		1,500,000
Amount paid to resolve preexisting relationship with seller											10,000,000
Reserves recognized prior to closing											14,402,000
Product warranty accrual		278,000	8,620,000			278,000	4,737,000	4,737,000	3,883,000	3,883,000
Inventory write-down									1,051,000
Number of facilities					3
Purchase commitments payments		4,353,000	4,347,000	4,270,000
Annual royalty payments in exchange for rights												$ 2,000,000