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Borrowings (Narrative) (Details)
$ / shares in Units, shares in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2015
USD ($)
shares
$ / shares
Aug. 01, 2015
USD ($)
shares
$ / shares
Jan. 31, 2015
USD ($)
Aug. 02, 2014
USD ($)
Jan. 24, 2009
Aug. 01, 2015
USD ($)
$ / shares
shares
Aug. 02, 2014
USD ($)
Jan. 14, 2015
USD ($)
$ / shares
shares
Nov. 01, 2014
USD ($)
Jan. 22, 2013
USD ($)
Jan. 20, 2010
USD ($)
Oct. 31, 2008
USD ($)
Debt Instrument                        
Proceeds from convertible notes           $ 565,656,000 $ 0          
Purchase of convertible hedge           86,135,000 0          
Proceeds from issuance of warrants           $ 51,175,000 0          
Senior Secured 2018 Notes                        
Debt Instrument                        
Debt Instrument, Face Amount                     $ 300,000,000  
Senior Secured 2020 Notes                        
Debt Instrument                        
Debt Instrument, Face Amount                     $ 300,000,000  
Stated annual interest rate   6.875%       6.875%            
Long-Term Debt, Fair Value                 $ 312,500,000      
Maturity           Feb. 13, 2015            
Debt Instrument, Redemption Price, Percentage           103.438%            
Irrevocable deposit               $ 322,200,000        
Repayment of principal amount               300,000,000        
Call premium               10,300,000        
Debt Instrument, Increase, Accrued Interest     $ 10,300,000                  
Unpaid interest deposited to escrow               1,600,000        
Call premium cost and original issue discount and debt issuance costs related to lenders that did not participate in refinancing           $ 20,400,000            
Convertible Senior Unsecured 2020 Notes                        
Debt Instrument                        
Debt Instrument, Face Amount               $ 575,000,000        
Proceeds from convertible notes $ 565,700,000                      
DiscountRateForFairValueOfLiabilityComponent 4.57%                      
Stated annual interest rate   1.375%       1.375%            
Debt Instrument, Convertible, Remaining Discount Amortization Period           4 years 5 months 1 day            
Long-Term Debt, Fair Value   $ 564,200,000       $ 564,200,000            
Maturity Jan. 01, 2020         Jan. 01, 2020            
Debt Instrument, Convertible, Conversion Ratio 62.7746 62.8255                    
Debt Instrument, Convertible, Number of Equity Instruments | shares 36.1 36.1                    
Debt Instrument, Convertible, Conversion Price | $ / shares   $ 15.92       $ 15.92   $ 15.93        
Debt Instrument, Convertible, If-converted Value in Excess of Principal           $ 0            
Repurchase price of notes in case of change in control, percentage of face value 100.00%                      
Shares Covered By Note Hedge | shares               36.1        
Note Hedge, Exercise Price | $ / shares $ 15.93 $ 15.92                    
Purchase of convertible hedge $ 86,100,000                      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares   36.1       36.1   36.1        
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares   $ 20.63       $ 20.63   $ 20.65        
Class of Warrant or Right, Date from which Warrants or Rights Exercisable Apr. 01, 2020                      
WarrantsMaturityPeriod 60 days                      
Proceeds from issuance of warrants $ 51,200,000                      
Interest Expense, Debt [Abstract]                        
Amortization of Debt Discount   $ 4,000,000       $ 8,800,000            
Interest Expense, Debt, Excluding Amortization   $ 2,000,000       $ 4,300,000            
Interest Expense, Debt       $ 0     $ 0          
Senior Unsecured 2023 Notes                        
Debt Instrument                        
Debt Instrument, Face Amount                   $ 300,000,000    
Stated annual interest rate   4.625%       4.625%            
Long-Term Debt, Fair Value   $ 299,300,000       $ 299,300,000     292,400,000      
Maturity           Jan. 15, 2023            
Repurchase price of notes in case of change in control, percentage of face value           101.00%            
Debt Instrument, Redemption Price, Percentage           100.00%            
Redemption amount of notes, percentage of principal amount, when using the net cash proceed from capital stock sale           35.00%            
Redemption price, percentage of principal amount, when using the net cash proceed from capital stock sale           104.625%            
Term Loan Facility                        
Debt Instrument                        
Original term of loan         5 years              
Senior secured credit facility, maximum borrowing capacity                       $ 1,100,000,000
Revolving Credit Facility                        
Debt Instrument                        
Original term of loan         5 years              
Senior secured credit facility, maximum borrowing capacity   125,000,000       $ 125,000,000     125,000,000     125,000,000
Line of Credit Facility, Fair Value of Amount Outstanding   0       0     0      
Swing Line Loan Subfacility                        
Debt Instrument                        
Senior secured credit facility, maximum borrowing capacity                       25,000,000
Letter Of Credit Subfacility                        
Debt Instrument                        
Senior secured credit facility, maximum borrowing capacity                       $ 25,000,000
Line of Credit   $ 0       $ 0     $ 0      
Trading Price Trigger One | Convertible Senior Unsecured 2020 Notes                        
Debt Instrument                        
Debt Instrument, Convertible, Threshold Trading Days 20                      
Debt Instrument, Convertible, Threshold Consecutive Trading Days 30 days                      
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger 130.00%                      
Trading Price Trigger Two | Convertible Senior Unsecured 2020 Notes                        
Debt Instrument                        
Debt Instrument, Convertible, Threshold Trading Days 5                      
Debt Instrument, Convertible, Threshold Consecutive Trading Days 10 days                      
Debt Instrument, Convertible, Threshold Percentage of Notes Price Trigger 98.00%