Acquisitions - Additional Information (Detail) $ in Thousands	12 Months Ended
May 31, 2016 USD ($)
Worthington Specialty Processing
Business Acquisition [Line Items]
Previously held percentage of ownership interest	51.00%
Business acquisition, date of acquisition agreement	Mar. 01, 2016
Gain on re-measurement of ownership interest to fair value	$ 6,877
Estimated fair value of previously held interest	$ 32,375
Worthington Specialty Processing \| Joint Venture Transactions
Business Acquisition [Line Items]
Percent of controlling interest by the Company	51.00%
Worthington Specialty Processing \| Joint Venture Transactions \| United States Steel Corporation
Business Acquisition [Line Items]
Percent of ownership interest by noncontrolling owner	49.00%
CryoScience
Business Acquisition [Line Items]
Business acquisition, date of acquisition agreement	Dec. 07, 2015
Total consideration for acquired entity	$ 30,584
Business acquisition, estimated working capital deficit adjustment	$ 772
NetBraze, LLC
Business Acquisition [Line Items]
Business acquisition, date of acquisition agreement	Jan. 15, 2016
Total consideration for acquired entity	$ 3,390
Business acquisition, contingent consideration estimated fair value	540
Business acquisition, working capital	1,565
Business acquisition, fixed assets	$ 1,825

Date when the business acquisition agreement was executed, in CCYY-MM-DD format.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of liability recognized arising from contingent consideration in a business combination.

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Amount of assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages.

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Percentage of equity in the acquiree held by the acquirer immediately before the acquisition date in a business combination.

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

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

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Business Acquisition Working Capital Deficit

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Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Working Capital

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