Restructuring and Other Expense (Income) - Additional Information (Detail) (USD $)	9 Months Ended	1 Months Ended		9 Months Ended	1 Months Ended	3 Months Ended	9 Months Ended	1 Months Ended	9 Months Ended
	Feb. 28, 2014	Dec. 10, 2013 Baltimore Steel Facility	Jun. 30, 2013 ITS	Feb. 28, 2014 Metal Framing	Oct. 31, 2012 Pressure Cylinders	May 31, 2013 Pressure Cylinders	Feb. 28, 2014 Pressure Cylinders	Nov. 12, 2013 Pressure Cylinders North America	Feb. 28, 2014 Commercial Stairs
Restructuring Cost and Reserve [Line Items]
Facility exit and other costs incurred				$ 934,000			$ 370,000	$ 242,000	$ 636,000
Gain/loss on sale of assets	10,587,000		4,762,000	(114,000)	50,000			5,939,000
Severance accrual adjustment		1,380,000				2,488,000	578,000	3,714,000
Cash proceeds from sale of assets			7,457,000
Future payments for restructuring	$ 7,238,000