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Long-Term Borrowings (Details)
$ in Millions, ₩ in Billions
6 Months Ended 12 Months Ended
Oct. 29, 2013
KRW (₩)
Oct. 29, 2013
USD ($)
Jun. 30, 2014
KRW (₩)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
KRW (₩)
item
Jun. 30, 2015
USD ($)
item
Jun. 30, 2014
USD ($)
Jun. 30, 2013
USD ($)
Jun. 30, 2015
USD ($)
Oct. 29, 2013
USD ($)
Debt Instrument [Line Items]                    
Number of facility agreements | item         3 3        
Facilities fees paid ₩ 0.9 $ 0.9         $ 0.4      
Amortization of fees           $ 0.2 0.3      
Interest expense           $ 3.6 $ 4.8 $ 7.1    
Period before maturity date, prepayment of facility may be withdrawn (in months)         3 months 3 months        
Facility A [Member]                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity         ₩ 60.0       $ 53.2  
Margin added on rate         3.10% 3.10%        
Facilities interest rate at period end         4.90%       4.90%  
Annual installments | ₩         ₩ 10.0          
Number of annual installments | item         3 3        
Maturity date         Oct. 29, 2018 Oct. 29, 2018        
Facility B [Member]                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity         ₩ 15.0       $ 13.3  
Margin added on rate         2.90% 2.90%        
Facility C [Member]                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity         ₩ 10.0       $ 8.9  
Margin added on rate         3.10% 3.10%        
Facilities interest rate at period end         4.90%       4.90%  
Korean Senior Secured Loan Facility [Member]                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity 92.4                 $ 87.0
Proceeds drawn from facilities 75.0 70.6                
Repayment of facilities 17.4 16.4                
Revolving Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Proceeds drawn from facilities ₩ 1.1 $ 1.0 ₩ 2.2 $ 2.1            
Commitment fee percentage         0.30% 0.30%        
Korean CD Rate [Member]                    
Debt Instrument [Line Items]                    
CD interest rate at period end         1.80%       1.80%  
Facilities Agreement [Member]                    
Debt Instrument [Line Items]                    
Proceeds drawn from facilities         ₩ 4.0 $ 3.8        
Facility agreement, in years         5 years 5 years        
Facilities Agreement [Member] | Revolving Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Secured loan facility                 $ 59.6  
Final Installment [Member] | Facility A [Member]                    
Debt Instrument [Line Items]                    
Annual installments | ₩         ₩ 30.0