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VAT Tax Issue in Brazil (Details Textual)
In Millions, unless otherwise specified
 1 Months Ended 3 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended
Oct. 31, 2010
USD ($)
Oct. 31, 2010
BRL
May 31, 2010
USD ($)
May 31, 2010
BRL
Oct. 31, 2009
USD ($)
Oct. 31, 2009
BRL
Apr. 30, 2013
BRL
Apr. 30, 2011
USD ($)
Apr. 30, 2011
BRL
Apr. 30, 2013
USD ($)
Apr. 30, 2011
Defended Based On Lapse Of Statute Limitations [Member]
USD ($)
Apr. 30, 2011
Defended Based On Lapse Of Statute Limitations [Member]
BRL
Apr. 30, 2011
Defended Based On State Auditor Misunderstanding [Member]
USD ($)
Apr. 30, 2011
Defended Based On State Auditor Misunderstanding [Member]
BRL
May 31, 2010
Original Claim 2004 2006 [Member]
USD ($)
May 31, 2010
Original Claim 2004 2006 [Member]
BRL
Oct. 31, 2010
Claim 2007-2009 By State Of Bahia [Member]
USD ($)
Oct. 31, 2010
Claim 2007-2009 By State Of Bahia [Member]
BRL
May 31, 2010
Claim 2007-2009 By State Of Bahia [Member]
USD ($)
May 31, 2010
Claim 2007-2009 By State Of Bahia [Member]
BRL
Apr. 30, 2013
Claim 2007-2009 By State Of Bahia [Member]
USD ($)
Apr. 30, 2013
Claim 2007-2009 By State Of Bahia [Member]
BRL
Apr. 30, 2013
Judicial deposit 2004-2006 [Member]
USD ($)
Apr. 30, 2013
Judicial deposit 2004-2006 [Member]
BRL
Apr. 30, 2013
Maximum [Member]
Apr. 30, 2013
Minimum [Member]
Foreign Currency Exchange Rate, Translation                   1.82                                
Value Added Tax Examination Claims Incurred In Period         $ 3.0 4.8                                        
Value Added Tax Examination Penalties and Interest Expense         3.5 5.6                                        
Value Added Tax Examination Income Tax Total         6.5 10.4                                        
Value Added Tax Claim Paid Amount     1.9 3.5                                            
Value Added Tax Credit Carryforward Amount             2.1     1.1                                
Value Added Tax Fines and Penalties Defendable 0.5 0.9                 0.6 1.0 0.2 0.3                        
Value Added Tax Paid Or Payable To Government Under Amnesty Program               5.0 9.2           2.2 3.5                    
Value Added Tax Payable During Period                                 5.5 11.1                
Value Added Tax Fines and Penalties             8.0                   2.4 4.9                
Value Added Tax Judicialdeposit                                         6.2 12.3        
Judicial Court Deposit Initial Estimated Time Period                                                 2 years 1 year 6 months
Value Added Tax Judicial Deposit To Be Paid By Pledging Asset                                             1.6 3.1    
Value Added Tax Loss Of Incentive Description             "Desenvolve" is an incentive remaining from Brazil's hyperinflationary days about 10 years ago. It is based on the net ICMS (VAT) tax payable. (QT pays ICMS to suppliers on raw materials, bills and collects ICMS from customers, takes credit for ICMS paid to suppliers and remits the difference. The net amount payable is payable 30% immediately and 70% for up to five years. The "desenvolve" is an incentive to pay the 70% quickly, like a cash discount. If the full amount is paid immediately, there is an 80% discount of the 70% (or 56% of the total).                                      
Other Tax Expense (Benefit)               1.6                                    
Value Added Tax Claim Received                                     3.1 6.2            
Tax Credit Carryforward Value Added Tax Noncurrent             3.4     1.9 [1]                                
Taxes Payable             6.2     $ 3.1 [1]                                
[1] At exchange rate prevailing in 2010 when recorded.