For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611

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- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Segment Data - Additional Information (Detail) - Segment	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013
Segment Reporting Information [Line Items]
Number of reportable segments	3
Pressure Cylinders
Segment Reporting Information [Line Items]
Percentage of consolidated net sales	30.00%	30.00%	30.00%
PSI Energy Solutions, LLC \| Joint Venture Transactions
Segment Reporting Information [Line Items]
Percent of controlling interest by the Company	75.00%
Professional Supply, Inc. \| Joint Venture Transactions
Segment Reporting Information [Line Items]
Percent of ownership interest by noncontrolling owner	20.00%
Stonehenge Structured Finance Partners, LLC \| Joint Venture Transactions
Segment Reporting Information [Line Items]
Percent of ownership interest by noncontrolling owner	5.00%