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Pensions and Other Postretirement Benefits - Fair Value of Pension Plan's Assets by Major Asset Category (Detail) (USD $)
In Thousands, unless otherwise specified
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Aug. 31, 2012
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Aug. 31, 2011
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| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Fair value of plan assets |
$ 42,072 |
$ 36,328 |
| Fair value of plan assets |
42,072 |
|
|
Common Collective Trust Funds [Member]
|
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Fair value of plan assets |
39,970 |
|
|
Real Estate Equity Funds [Member]
|
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Fair value of plan assets |
2,102 |
|
| Fair value of plan assets |
2,102 |
677 |
|
Level 1 [Member]
|
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Fair value of plan assets |
0 |
|
|
Level 1 [Member] | Common Collective Trust Funds [Member]
|
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Fair value of plan assets |
0 |
|
|
Level 1 [Member] | Real Estate Equity Funds [Member]
|
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Fair value of plan assets |
0 |
|
|
Level 2 [Member]
|
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Fair value of plan assets |
39,970 |
|
|
Level 2 [Member] | Common Collective Trust Funds [Member]
|
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Fair value of plan assets |
39,970 |
|
|
Level 3 [Member]
|
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Fair value of plan assets |
2,102 |
|
|
Level 3 [Member] | Real Estate Equity Funds [Member]
|
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
| Fair value of plan assets |
$ 2,102 |
|