Restructuring And Other Expense (Income) (Narrative) (Details) (USD $)	6 Months Ended
Nov. 30, 2011
Restructuring Cost and Reserve [Line Items]
Professional fees	$ 3,785,000
Severance accrual adjustment	(7,925,000)
Early Retirement And Severance [Member]
Restructuring Cost and Reserve [Line Items]
Severance accrual adjustment	1,041,000
Facility Exit And Other Costs [Member]
Restructuring Cost and Reserve [Line Items]
Post-closure facility exit and other costs were incurred	5,215,000
Severance accrual adjustment	(5,181,000)
Metal Framing [Member]
Restructuring Cost and Reserve [Line Items]
Cash proceeds from sale of assets for sale assets	2,867,000
Gain on sale of assets held for sale	1,385,000
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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