Restructuring And Other Expense (Narrative) (Details) (USD $)	9 Months Ended
Feb. 29, 2012
Restructuring Cost and Reserve [Line Items]
Professional fees	$ 4,758,000
Facility exit and other costs incurred	7,681,000
Severance accrual adjustment	(11,428,000)
Early Retirement And Severance [Member]
Restructuring Cost and Reserve [Line Items]
Severance accrual adjustment	960,000
Metal Framing [Member]
Restructuring Cost and Reserve [Line Items]
Cash proceeds from sale of assets for sale assets	8,151,000
Gain on sale of assets held for sale	2,120,000
Vinyl Business [Member]
Restructuring Cost and Reserve [Line Items]
Cash proceeds from sale of assets for sale assets	6,125,000
Gain on sale of assets held for sale	$ 766,000

The difference between the proceeds received and the carrying value of the long-lived asset. If the proceeds received exceeds the carrying value of the long-lived asset, then there is a gain. If the proceeds received is less than the carrying value of the long-lived asset, then there is a loss.

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The charge against earnings in the period, comprised of costs associated with restructuring activities not otherwise specified in the taxonomy pursuant to a duly authorized plan, excluding a discontinued operation as defined by generally accepted accounting principles. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, but excludes costs associated with the retirement of a long-lived asset and severance costs associated with established compensation plans.

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