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Postretirement and Other Employee Benefits (Fair Value of Plan Assets) (Details 4) - USD ($)
$ in Thousands
Aug. 31, 2016
Aug. 31, 2015
Aug. 31, 2014
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 143,702 $ 134,808 $ 136,451
Fair value of plan assets allocation 100.00% 100.00%  
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 3,565 $ 4,567  
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 124,003 116,037  
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 16,134 14,204  
Cash and Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 3,565 $ 4,567  
Fair value of plan assets allocation 3.00% 3.00%  
Cash and Cash Equivalents | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 3,565 $ 4,567  
Equity Securities | Global Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 41,515 [1] $ 24,143  
Fair value of plan assets allocation 29.00% 18.00%  
Equity Securities | U.K. Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   $ 24,211  
Fair value of plan assets allocation   18.00%  
Equity Securities | Level 2 | Global Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 41,515 [1] $ 24,143 [2]  
Equity Securities | Level 2 | U.K. Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [3]   24,211  
Debt Securities | U.K. Corporate Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 27,268 $ 50,817  
Fair value of plan assets allocation 19.00% 38.00%  
Debt Securities | U.K. Government Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 34,359 $ 16,866  
Fair value of plan assets allocation 24.00% 12.00%  
Debt Securities | Global government bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 6,136    
Fair value of plan assets allocation 4.00%    
Debt Securities | Global corporate bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 14,725    
Fair value of plan assets allocation 10.00%    
Debt Securities | Level 2 | U.K. Corporate Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 27,268 [4] $ 50,817 [5]  
Debt Securities | Level 2 | U.K. Government Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 34,359 [6] 16,866 [7]  
Debt Securities | Level 2 | Global government bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [8] 6,136    
Debt Securities | Level 2 | Global corporate bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [9] 14,725    
Insurance Contracts      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 16,134 $ 14,204  
Fair value of plan assets allocation 11.00% 11.00%  
Insurance Contracts | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [10] $ 16,134 $ 14,204  
[1] Global equity securities are categorized as Level 2 and include investments that aim to capture global equity market returns by tracking the Morgan Stanley Capital International (“MSCI”) World Index and other similar world stocks indexes.
[2] Global equity securities are categorized as Level 2 and include investme nts that aim to capture global equity market returns by tracking the Financial Times (London) Stock Exchange (“FTSE”) AW-World (ex-UK) Index and other similar indexes in Germany.
[3] U.K. equity securities are categorized as Level 2 and include investmen ts in a diversified portfolio that aims to capture the returns of the U.K. equity market. The portfolio tracks the FTSE All-Share Index and invests only in U.K. securities.
[4] U.K. corporate bonds are categorized as Level 2 and include U.K. corporate issued fixed income investments which are managed and tracked to the respective benchmark (Bank of America Merrill Lynch (" Bo f AML ") Sterling Corporate & Collateralised All-Stocks (Exclu ding Subordinated Financials)).
[5] U.K. corporate bonds are categorized as Level 2 and include U.K. corporate issued fixed income investments which are managed and tracked to the respective benchmark (AAA-AA-A Bonds-Over 15Y Index).
[6] U.K. government bonds are categorized as Level 2 and include U.K. government issued inflation-linked income investments which are managed and tracked to the respective benchmarks ( FTSE Actuaries UK Index-Linked Gilts Ov er 5 Years) and a custom benchmark based on the longest gilts in issue).
[7] U.K. government bonds are categorized as Level 2 and include U.K. government-issued fixed income investments which are managed an d tracked to the respective benchmark (FTSE U.K. Over 15 Years Gilts Index and FTSE U.K. Over 5 Years Index-Linked).
[8] Global government bonds are categorized as Level 2 and include emerging market government issued fixed income investments which are managed and tracked to the respective benchmar k ( J.P.Morgan GBI-EM Global Diversified).
[9] Global corporate bonds are categorized as Level 2 and include global corporate issued fixed income investments which are managed and tracked to the respective benchmarks ( BofAML Developed Market BB/B Global Hi gh Yield Constrained Index; BofAML Global High Yield Constrained and Standard & Poor's ("S&P")/Loan Syndications & Trading Association ("LSTA") US Leveraged Loan Hedged).
[10] The assets related to The Netherlands plan consist of an insurance contract that guarantees the payment of the funded pension entitlements, as well as provides a profit share to the Company. The profit share in this contract is not based on actual investments, but, instead on a notional investment portfolio that is expected to return a pre-defined rate. Insurance contract assets are recorded at fair value, which is determined based on the cash surrender value of the insured benefits which is the present value of the guaranteed funded benefits. Insurance contracts are valued using unobs ervable inputs (Level 3 inputs), primarily by discounting expected future cash flows relating to benefits paid from a notional investment portfolio in order to determine the cash surrender value of the policy. The unobservable inputs consist of estimated f uture benefits to be paid throughout the duration of the policy and estimated discount rates, which both have an immaterial impact on the fair value estimate of the contract.