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Fair Value - Assets Measured at Fair Value on Non-Recurring Basis (Detail) - Fair Value, Nonrecurring - USD ($)
$ in Thousands
Feb. 29, 2020
May 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset measured at fair value on non-recurring basis $ 23,918 $ 11,938
Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset measured at fair value on non-recurring basis 10,295 11,938
Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset measured at fair value on non-recurring basis 13,623  
Investment In Unconsolidated Affiliate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset measured at fair value on non-recurring basis 13,623 [1],[2] 3,700 [3]
Investment In Unconsolidated Affiliate | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset measured at fair value on non-recurring basis [3]   3,700
Investment In Unconsolidated Affiliate | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset measured at fair value on non-recurring basis [1],[2] 13,623  
Long Lived Assets Held For Sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset measured at fair value on non-recurring basis 4,084 [4],[5],[6] 7,000 [7]
Long Lived Assets Held For Sale | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset measured at fair value on non-recurring basis 4,084 [4],[5],[6] 7,000 [7]
Long Lived Assets Held And Used    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset measured at fair value on non-recurring basis 6,211 [8],[9] 1,238 [10]
Long Lived Assets Held And Used | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset measured at fair value on non-recurring basis $ 6,211 [8],[9] $ 1,238 [10]
[1] During the first quarter of fiscal 2020, we determined our 10% minority ownership interest in our Nisshin joint venture was fully impaired based on the estimated recoverability of the related assets.
[2] On November 1, 2019, in connection with the contribution of substantially all of the net assets of the Engineered Cabs business to the newly-formed Cabs joint venture, we obtained a 20% minority ownership interest.  In accordance with the applicable accounting guidance, our minority ownership interest in the Cabs joint venture was recorded at its acquisition date fair value of $13,623,000
[3] During the fourth quarter of fiscal 2019, we determined our 10% minority ownership interest in our Nisshin joint venture was other than temporarily impaired due to current and projected operating losses.  As a result, the investment had been written down to its estimated fair value of $3,700,000, resulting in an impairment charge of $4,017,000 within equity income of unconsolidated affiliates.
[4] During the first quarter of fiscal 2020, the Company identified an impairment indicator for the fabricated products business in Stow, Ohio within the former Engineered Cabs operating segment.  As a result, fixed assets with a net book value of $1,469,000 and lease ROU assets with a net book value of $3,938,000 were deemed to be fully impaired and written off.
[5] During the third quarter of fiscal 2020, in connection with the closure of the oil & gas operations in Wooster, Ohio, fixed assets consisting of land and a building written down to their estimated fair market value of $3,384,000
[6] During the third quarter of fiscal 2020, the Company’s consolidated joint venture, WSP committed to plans to sell its Canton, Michigan facility and some of the production equipment at that facility.  In accordance with the applicable accounting guidance, certain production equipment was recorded at the lower of net book value or fair value less costs to sell.  The book value of the WSP production equipment exceeded the estimated fair value of $700,000, resulting in an impairment charge of $1,274,000.
[7] During the first quarter of fiscal 2019, changes in facts and circumstances related to the planned sale of our cryogenics business in Turkey, Worthington Aritas, resulted in our lowering the estimate of fair value less cost to sell to $7,000,000, generating an impairment charge of $2,381,000
[8]

During the third quarter of fiscal 2020, the Company identified an impairment indicator for our oil & gas equipment business and performed an interim impairment test of the reporting unit.  In accordance with the applicable accounting guidance, the book value of the corresponding goodwill was written off, resulting in an impairment charge of $22,097,000.

[9] During the third quarter of fiscal 2020, in connection with the closure of the oil & gas operations in Wooster, Ohio, customer list intangible assets were determined to be fully impaired and written off.  In addition, the remaining fixed assets at Wooster, Ohio were written down to their estimated fair value of $6,211,000.
[10] During the fourth quarter of fiscal 2019, in connection with the closure of the CNG fuel systems facility in Salt Lake City, Utah, long-lived assets consisting primarily of technology-related intangible assets and fixed assets were written down to their estimated fair value of $238,000, resulting in an impairment charge of $2,167,000.  During the fourth quarter of fiscal 2019, certain long-lived assets at our consolidated joint venture, WSP, were written down to their estimated fair value of $1,000,000, resulting in an impairment charge of $3,269,000