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Divestiture Activities- Additional Information (Detail) - USD ($) $ in Thousands |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 19, 2018 | Dec. 01, 2017 | Aug. 31, 2019 | May 31, 2019 | Feb. 28, 2019 | Nov. 30, 2018 | Aug. 31, 2018 | Aug. 31, 2017 | Aug. 31, 2019 | Aug. 31, 2018 | Aug. 31, 2017 | Jul. 09, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment & divestiture charges |  |  |  | $ 6,200 | $ (13,000) | $ 6,100 | $ 23,500 |  |  | $ 22,827 | $ 2,987 | $ 116,979 |
Goodwill, Impairment Charge |  |  |  |  |  |  |  |  |  | 13,678 |  |  |
Rental asset buyout for Viking divestiture |  |  |  |  |  |  |  |  |  | 0 | (27,718) | 0 |
Proceeds from sale of businesses, net of transaction costs |  |  |  |  |  |  |  |  |  | 0 | 8,902 | 0 |
Divestiture Charges |  |  |  |  |  |  |  |  |  | 10,500 |  |  |
Asset Impairment Charges |  |  |  |  |  |  |  |  |  |  |  | $ 116,979 |
Remaining EC&S Segment [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
SPA Agreed Cash Proceeds from Future Divestiture of Business |  |  |  |  |  |  |  |  |  |  |  |  | $ 214,500
Payments in quarterly installments |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000
Impairment & divestiture charges |  |  |  |  |  |  |  |  |  | 264,500 |  |  |
Goodwill, Impairment Charge |  |  |  |  |  |  |  |  |  | 210,000 |  |  |
Cumulative Effect of Foreign Currency Rate Change Since Acquisition |  |  |  |  |  |  |  |  |  | 54,500 |  |  |
Precision-Hayes International [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment & divestiture charges |  |  |  |  |  |  |  | $ 23,700 |  | 9,500 |  |  |
Goodwill, Impairment Charge |  |  |  |  |  |  |  | 17,500 |  |  |  |  |
Impairment of Intangible Assets (Excluding Goodwill) |  |  |  |  |  |  |  | 5,000 |  |  |  |  |
Disposal Date | Dec. 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of businesses, net of transaction costs | $ 23,600 |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  |  |  |  |  | $ 1,200 |  |  |  |  |
Cortland Fibron [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment & divestiture charges |  |  |  |  |  |  |  |  |  | $ 1,700 | 46,300 |  |
Goodwill, Impairment Charge |  |  |  |  |  |  |  |  |  |  | 10,500 |  |
Cumulative Effect of Foreign Currency Rate Change Since Acquisition |  |  |  |  |  |  |  |  |  |  | 35,300 |  |
Disposal Date |  | Dec. 19, 2018 |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of businesses, net of transaction costs |  | $ 12,500 |  |  |  |  |  |  |  |  |  |  |
Divestiture Charges |  |  |  |  |  |  |  |  |  |  | 500 |  |
Viking [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment & divestiture charges |  |  |  |  |  |  |  |  | $ 117,000 |  | 12,400 |  |
Cumulative Effect of Foreign Currency Rate Change Since Acquisition |  |  |  |  |  |  |  |  | 69,000 |  |  |  |
Rental asset buyout for Viking divestiture |  |  |  |  |  |  |  |  | 28,600 |  |  |  |
Disposal Date |  |  | Dec. 01, 2017 |  |  |  |  |  |  |  |  |  |
Proceeds from sale of businesses, net of transaction costs |  |  | $ 8,800 |  |  |  |  |  |  |  |  |  |
Business Exit Costs |  |  |  |  |  |  |  |  |  |  | 3,000 |  |
Discrete Income Tax Expense |  |  |  |  |  |  |  |  |  |  | 9,400 |  |
Impairment of Long-Lived Assets to be Disposed of |  |  |  |  |  |  |  |  | 16,100 |  |  |  |
Impairment and other divestiture charges |  |  |  |  |  |  |  |  | $ 3,300 |  |  |  |
Disposal Group, Annual Revenue |  |  |  |  |  |  |  |  |  |  | $ 2,700 |  |

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