Contingent Liabilities - Additional Information (Detail) (USD $)	3 Months Ended	6 Months Ended
Nov. 30, 2014	Nov. 30, 2014
Commitment And Contingencies [Line Items]
Insurance proceeds for replacement value of damaged property and equipment	$ 1,089,000	$ 11,721,000
Book value of assets		243,000
Gain on damaged property and equipment		846,000
Business interruption
Commitment And Contingencies [Line Items]
Insurance proceeds for replacement value of damaged property and equipment		3,940,000
Other expenses
Commitment And Contingencies [Line Items]
Insurance proceeds for replacement value of damaged property and equipment		1,001,000
Manufacturing Expense \| Business interruption
Commitment And Contingencies [Line Items]
Insurance proceeds for replacement value of damaged property and equipment		1,072,000
Manufacturing Expense \| Other expenses
Commitment And Contingencies [Line Items]
Insurance proceeds for replacement value of damaged property and equipment		$ 256,000

Amount of gain recognized in the income statement for an event or transaction, that is unusual in nature or occurs infrequently, but not both.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 20

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6365513&loc=d3e15138-107781

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The gross income statement effect of insurance proceeds for each material event or transaction (that would not reasonably be expected to recur in the foreseeable future) that possesses a high degree of abnormality and are clearly unrelated to, or incidentally related to, the ordinary and typical activities of the entity.

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Amount of loss recognized in the income statement for an event or transaction, that is unusual in nature or occurs infrequently, but not both.

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