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Contingent Liabilities - Additional Information (Detail) (USD $)	3 Months Ended
	Aug. 31, 2013
Loss Contingencies [Line Items]
Exposure Related to Legal Matter	$ 2,000,000
Loss related to litigation settlement	2,000,000
Impairment of fixed assets destroyed in fire	4,641,000
Pressure Cylinders \| AUSTRIA
Loss Contingencies [Line Items]
Impairment of fixed assets destroyed in fire	$ 358,000

- Definition

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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