Net Periodic Benefit Costs (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
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Aug. 31, 2016 |
Aug. 31, 2015 |
Aug. 31, 2014 |
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| Other Postretirement Benefit Plan, Defined Benefit | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Net benefit cost (income) | $ 100 | $ (119) | $ (242) |
| United States Pension Plan of US Entity | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Interest cost | 1,970 | 1,920 | 2,146 |
| Expected return on assets | (2,997) | (3,143) | (2,959) |
| Amortization of actuarial loss | 837 | 828 | 667 |
| Net benefit cost (income) | $ (190) | $ (395) | $ (146) |
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- Definition The amount of gains or losses recognized in net periodic benefit cost. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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