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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Aug. 31, 2016 USD ($) Segment | Aug. 31, 2015 USD ($) | Aug. 31, 2014 USD ($)
Significant Accounting Policies [Line Items] |  |  |
Product Warranty Accrual | $ 5,592 | $ 3,719 | $ 4,056
Number of reportable segments | Segment | 3 |  |
Portion of inventory determined using last-in, first-out ("LIFO") method | 21.00% | 22.10% |
Inventory LIFO reserve | $ 3,700 | $ 5,600 |
Unearned Revenue | 7,700 | 8,300 |
Accounts Receivable, allowance for doubtful accounts | 7,800 | 4,000 |
Restructuring charges | 14,571 | 0 | 0
Research and development costs | 18,300 | 17,700 | 20,000
Foreign exchange transaction (gains)/losses | 1,300 | 100 | 4,200
Product Warranty Accrual, Additions from Business Acquisition | 3 | 0 |
Product Warranty Accrual, Warranties Issued | 5,985 | 4,929 |
Product Warranty Accrual, Payments | (4,058) | (5,009) |
Product Warranty Accrual, Currency Translation, Increase (Decrease) | (57) | (257) |
Interest Income, Other | $ 1,700 | $ 1,900 | $ 1,000
Minimum | Buildings and improvements |  |  |
Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment useful life | 10 years |  |
Minimum | Machinery and equipment |  |  |
Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment useful life | 2 years |  |
Maximum | Buildings and improvements |  |  |
Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment useful life | 40 years |  |
Maximum | Machinery and equipment |  |  |
Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment useful life | 15 years |  |

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