Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Aggregation of the liabilities reported on the balance sheet measured at fair value on a nonrecurring basis by the entity.

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Fair Value - Additional Information (Detail) - USD ($)	3 Months Ended	9 Months Ended
Fair Value - Additional Information (Detail) - USD ($)	Nov. 30, 2017	Feb. 28, 2018	May 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of long-lived assets		$ 8,289,000
Asset measured at fair value on non-recurring basis		0	$ 0
Liabilities measured at fair value on non-recurring basis		0	0
WEI Reporting Unit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of long-lived assets	$ 7,325,000
Asset measured at fair value on non-recurring basis	0
Bremen, Ohio
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of long-lived assets	964,000
Asset measured at fair value on non-recurring basis	$ 100,000
Long-term Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt at fair value including current maturities		799,636,000	618,059,000
Long-term debt at carrying amount including current maturities		$ 781,863,000	$ 578,487,000