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Net Periodic Benefit Costs (Detail) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
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Aug. 31, 2012
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Aug. 31, 2011
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Aug. 31, 2010
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| Schedule of Net Periodic Benefit Costs and Assumptions for Defined Benefit Postretirement Plans [Line Items] | |||
| Interest cost | $ 2,162 | $ 2,108 | $ 2,306 |
| Expected return on assets | (2,471) | (2,221) | (2,568) |
| Amortization of actuarial loss | 675 | 669 | 310 |
| Net benefit cost | $ 366 | $ 556 | $ 48 |
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- Details
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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
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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