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Fair Value Measurements (Details) (USD $)
3 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended
Aug. 02, 2014
Aug. 02, 2014
Aug. 03, 2013
Feb. 01, 2014
Aug. 02, 2014
Minimum
Aug. 03, 2013
Minimum
Aug. 02, 2014
Maximum
Aug. 03, 2013
Maximum
Aug. 02, 2014
Nonrecurring basis
Aug. 03, 2013
Nonrecurring basis
Aug. 02, 2014
Nonrecurring basis
Level 3
Feb. 01, 2014
Nonrecurring basis
Level 3
Aug. 02, 2014
Recurring basis
Aug. 02, 2014
Recurring basis
Level 1
Aug. 02, 2014
Recurring basis
Level 2
Aug. 02, 2014
Recurring basis
Level 3
Aug. 02, 2014
Short-term investments
Recurring basis
Aug. 02, 2014
Short-term investments
Recurring basis
Level 1
Aug. 02, 2014
Short-term investments
Recurring basis
Level 2
Aug. 02, 2014
Short-term investments
Recurring basis
Level 3
Aug. 02, 2014
Long-term investments
Recurring basis
Aug. 02, 2014
Long-term investments
Recurring basis
Level 1
Aug. 02, 2014
Long-term investments
Recurring basis
Level 2
Aug. 02, 2014
Long-term investments
Recurring basis
Level 3
Aug. 02, 2014
Certificates of deposit
Short-term investments
Recurring basis
Aug. 02, 2014
Certificates of deposit
Short-term investments
Recurring basis
Level 1
Aug. 02, 2014
Certificates of deposit
Short-term investments
Recurring basis
Level 2
Aug. 02, 2014
Certificates of deposit
Short-term investments
Recurring basis
Level 3
Aug. 02, 2014
Commercial paper
Short-term investments
Recurring basis
Aug. 02, 2014
Commercial paper
Short-term investments
Recurring basis
Level 1
Aug. 02, 2014
Commercial paper
Short-term investments
Recurring basis
Level 2
Aug. 02, 2014
Commercial paper
Short-term investments
Recurring basis
Level 3
Aug. 02, 2014
Corporate bonds
Short-term investments
Recurring basis
Aug. 02, 2014
Corporate bonds
Short-term investments
Recurring basis
Level 1
Aug. 02, 2014
Corporate bonds
Short-term investments
Recurring basis
Level 2
Aug. 02, 2014
Corporate bonds
Short-term investments
Recurring basis
Level 3
Aug. 02, 2014
Corporate bonds
Long-term investments
Recurring basis
Aug. 02, 2014
Corporate bonds
Long-term investments
Recurring basis
Level 1
Aug. 02, 2014
Corporate bonds
Long-term investments
Recurring basis
Level 2
Aug. 02, 2014
Corporate bonds
Long-term investments
Recurring basis
Level 3
Aug. 02, 2014
U.S. Agency securities
Short-term investments
Recurring basis
Aug. 02, 2014
U.S. Agency securities
Short-term investments
Recurring basis
Level 1
Aug. 02, 2014
U.S. Agency securities
Short-term investments
Recurring basis
Level 2
Aug. 02, 2014
U.S. Agency securities
Short-term investments
Recurring basis
Level 3
Aug. 02, 2014
U.S. Agency securities
Long-term investments
Recurring basis
Aug. 02, 2014
U.S. Agency securities
Long-term investments
Recurring basis
Level 1
Aug. 02, 2014
U.S. Agency securities
Long-term investments
Recurring basis
Level 2
Aug. 02, 2014
U.S. Agency securities
Long-term investments
Recurring basis
Level 3
Aug. 02, 2014
Municipal bonds
Long-term investments
Recurring basis
Aug. 02, 2014
Municipal bonds
Long-term investments
Recurring basis
Level 1
Aug. 02, 2014
Municipal bonds
Long-term investments
Recurring basis
Level 2
Aug. 02, 2014
Municipal bonds
Long-term investments
Recurring basis
Level 3
Fair value measurements                                                                                                        
Investments       $ 16,100,000                                                                                                
Level 1 to Level 2 Transfers 0 0 0                                                                                                  
Level 2 to Level 1 Transfers 0 0 0                                                                                                  
Short-term investments                                 12,434,000 0 12,434,000 0         5,910,000 0 5,910,000 0 3,696,000 0 3,696,000 0 2,027,000 0 2,027,000 0         801,000 0 801,000 0                
Long-term investments                                         3,402,000 0 3,402,000 0                         220,000 0 220,000 0         900,000 0 900,000 0 2,282,000 0 2,282,000 0
Total assets                         15,836,000 0 15,836,000 0                                                                        
Assets measured on a nonrecurring basis                                                                                                        
Carrying value of long-lived assets held and used                 200,000 100,000                                                                                    
Fair value of long-lived assets held and used                 40,000 5,000 40,000 5,000                                                                                
Asset Impairment Charges $ 100,000 $ 100,000 $ 100,000           $ 100,000 $ 100,000                                                                                    
Annual sales growth         3.00% 3.00% 9.80% 9.80%                                                                                        
Weighted average cost of capital   15.80% 15.80%