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Postretirement and Other Employee Benefits (Benefit Obligations and Plan Assets, Changes in Benefit Obligation and Plan Assets and Funded Status of Plans) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Aug. 31, 2018 | Aug. 31, 2017 | Aug. 31, 2016
Change in projected benefit obligation |  |  |
Beginning projected benefit obligation | $ 167,714 | $ 182,278 |
Service cost | 1,063 | 1,068 | $ 883
Interest cost | 3,807 | 2,942 | 4,844
Actuarial (gain) loss | (6,019) | (10,147) |
Curtailments gain | (998) | 0 |
Settlements paid from plan assets | 0 | (2,133) |
Total benefits paid | (6,211) | (6,790) |
Plan participants’ contributions | 31 | 27 |
Amendments | 1,864 | 0 |
Terminations | 0 | (106) |
Effect of conversion to U.S. dollars | (147) | 575 |
Ending projected benefit obligation | 161,104 | 167,714 | 182,278
Change in plan assets |  |  |
Beginning fair value of plan assets | 146,698 | 143,702 |
Actual return on plan assets | 8,146 | 2,582 |
Settlements paid from plan assets | 0 | (2,133) |
Employer contributions | 1,811 | 6,981 |
Benefits paid from plan assets | (4,758) | (3,759) |
Plan participants’ contributions | 31 | 27 |
Effect of conversion to U.S. dollars | (213) | (702) |
Ending fair value of plan assets | 151,715 | 146,698 | $ 143,702
Unfunded status | (9,389) | (21,016) |
Amounts recognized in the Consolidated Balance Sheets |  |  |
Accrued benefit liability, current | 428 | 182 |
Accrued benefit liability, noncurrent | 8,961 | 20,834 |
Accumulated other comprehensive loss (income) |  |  |
Actuarial loss, before tax | 22,387 | 32,247 |
Prior service cost (credit), before tax | 719 | $ (1,185) |
Net actuarial loss expected to be amortized to net period benefit cost in next fiscal year | 800 |  |
Prior service credit expected to be amortized to net periodic benefit cost in next fiscal year | $ 0 |  |

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- Definition Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as noncurrent. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109237824&loc=d3e1703-114919 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109237824&loc=d3e1731-114919 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(24)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant