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Fair Value of Financial Instruments-adjusted historical cost (Details) - USD ($)
$ in Thousands
May. 31, 2015
Nov. 30, 2014
Senior notes [Member] | 7.625% Senior Notes, Due 2020 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Stated interest rate 7.625%  
Senior notes [Member] | 6.875% senior notes due 2022 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Stated interest rate 6.875%  
Senior notes [Member] | 5.00% Senior Notes, Due 2025 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Stated interest rate 5.00%  
Bonds [Member] | 4.25% Yen-denominated Eurobonds, due 2016 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Stated interest rate 4.25%  
Fair Value, Measurements, Recurring [Member] | Carrying Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term debt carried at adjusted historical cost $ 30,369 $ 31,742
Total financial liabilities carried at adjusted historical cost 1,196,537 1,229,228
Fair Value, Measurements, Recurring [Member] | Carrying Value [Member] | Senior notes [Member] | 7.625% Senior Notes, Due 2020 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Fair Value 0 526,779
Fair Value, Measurements, Recurring [Member] | Carrying Value [Member] | Senior notes [Member] | 6.875% senior notes due 2022 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Fair Value 535,770 536,501
Fair Value, Measurements, Recurring [Member] | Carrying Value [Member] | Senior notes [Member] | 5.00% Senior Notes, Due 2025 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Fair Value 488,434 0
Fair Value, Measurements, Recurring [Member] | Carrying Value [Member] | Bonds [Member] | 4.25% Yen-denominated Eurobonds, due 2016 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Fair Value 31,902 34,108
Fair Value, Measurements, Recurring [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term debt carried at adjusted historical cost 30,369 31,742
Total financial liabilities carried at adjusted historical cost 1,246,283 1,308,038
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Senior notes [Member] | 7.625% Senior Notes, Due 2020 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Fair Value [1] 0 556,967
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Senior notes [Member] | 6.875% senior notes due 2022 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Fair Value [1] 585,051 583,848
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Senior notes [Member] | 5.00% Senior Notes, Due 2025 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Fair Value [1] 487,826 0
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Bonds [Member] | 4.25% Yen-denominated Eurobonds, due 2016 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Fair Value [1] 32,975 35,383
Senior revolving credit facility [Member] | Fair Value, Measurements, Recurring [Member] | Carrying Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term debt carried at adjusted historical cost 110,062 100,098
Senior revolving credit facility [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term debt carried at adjusted historical cost $ 110,062 $ 100,098
[1] Fair values are estimated using Level 1 inputs and incorporate mid-market price quotes. Level 1 inputs are inputs which consist of quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.