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Shareholders’ Equity - 1995 Stock Option Plan (Details)
shares in Millions
1 Months Ended 4 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2016
employee
Jan. 28, 2017
shares
Jan. 31, 2015
Performance-based Equity Awards | Executive Officers        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of employees who later joined the Company who were granted with equity awards | employee   4    
Performance RSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected achievement percentage of performance awards     100.00%  
Employee Stock Option Plan, 1995 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares reserved for issuance, authorized     383.4  
Equity awards, expiration period     10 years  
Number of shares available for future issuance     98.6  
Employee Stock Option Plan, 1995 Plan | Incentive Stock Option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity awards, expiration period     5 years  
Percentage of ownership in outstanding stock (greater than)     10.00%  
Employee Stock Option Plan, 1995 Plan | Incentive Stock Option | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock option, purchase price as percentage of fair market value     110.00%  
Equity awards, vesting period     2 years  
Employee Stock Option Plan, 1995 Plan | Incentive Stock Option | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity awards, vesting period     5 years  
Employee Stock Option Plan, 1995 Plan | Performance RSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity awards, vesting period 2 years      
Employee Stock Option Plan, 1995 Plan | Performance RSUs | Vesting on April 1, 2015        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity awards, vesting percentage 50.00%      
Employee Stock Option Plan, 1995 Plan | Performance RSUs | Vesting on April 1, 2016        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity awards, vesting percentage 50.00%      
Employee Stock Option Plan, 1995 Plan | Financial Performance RSU | First Anniversary        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity awards, vesting percentage       50.00%
Employee Stock Option Plan, 1995 Plan | Financial Performance RSU | Second Anniversary        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity awards, vesting percentage       50.00%
Employee Stock Option Plan, 1995 Plan | Strategic Performance Award | First Anniversary        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity awards, vesting percentage       50.00%
Employee Stock Option Plan, 1995 Plan | Strategic Performance Award | Second Anniversary        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity awards, vesting percentage       50.00%