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Share-based Payment - Fair Value of Share Options and Assumptions (Detail)
Jul. 29, 2014
USD ($)
yr
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Share price | $ / shares $ 21.11
Exercise price | $ / shares $ 21.11
Expected volatility 47.40%
Expected dividends 5.81%
Bottom of range [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Fair value at measurement date | $ $ 5.7
Expected option life (years) | yr 3.5
Risk-free interest rate 1.40%
Top of range [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Fair value at measurement date | $ $ 6.74
Expected option life (years) | yr 5.5
Risk-free interest rate 2.00%