Employee Pension Plans - Additional Information (Detail) - USD ($)	12 Months Ended
May. 31, 2015	May. 31, 2014	May. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Estimated net loss	$ (433,654)
Description of investment policy and strategy for the defined benefit plan	The investment policy and strategy for the defined benefit plan is (i) long-term in nature with liquidity requirements that are anticipated to be minimal due to the projected normal retirement date of the average employee and the current average age of participants
Weighted-average asset allocation	100.00%	100.00%
Expected employer contribution to defined benefit plan during fiscal 2016	$ 0
Net periodic pension costs	$ (254,000)	$ (248,000)	$ 194,000
Assumed salary rate increase	0.00%	0.00%	0.00%
Discount rate	4.38%	4.44%	4.16%
Fixed Income Investments \| Minimum
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocation	20.00%
Fixed Income Investments \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocation	40.00%
Austrian Pressure Cylinders
Defined Benefit Plan Disclosure [Line Items]
Accrued liability of unfunded plans included in other liabilities	$ 5,564,000	$ 6,440,000
Net periodic pension costs	$ 718,000	$ 677,000	$ 689,000
Assumed salary rate increase	3.00%	3.00%	3.00%
Discount rate	1.60%	3.25%	4.50%
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocation	53.00%	52.00%
Equity Securities \| Minimum
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocation	60.00%
Equity Securities \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocation	80.00%

The interest rate used to adjust for the time value of money.

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Expected rate of compensation increases (for pay-related plans).

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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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Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

+ References

No definition available.

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A narrative description of investment policies and strategies, including target allocation percentages or range of percentages considering the major categories of plan assets as of the latest statement of financial position presented (on a weighted-average basis for employers with more than one plan), and other factors that are pertinent to an understanding of those policies and strategies such as investment goals, risk management practices, allowable and prohibited investment types including the use of derivatives, diversification, and the relationship between plan assets and benefit obligations. For investment funds disclosed as major categories, the narrative description would be expected to also include a description of the significant investment strategies of those funds.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2446-114920

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-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

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The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

+ References

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

-Publisher FASB

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- Definition

Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

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-Paragraph 5

-Subparagraph (c)

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- Definition

Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position.

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Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. For classified balance sheets, used to reflect the noncurrent portion of the liabilities (due beyond one year or one operating cycle, if longer); for unclassified balance sheets, used to reflect the total liabilities (regardless of due date).

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