Rendering

Component: (Network and Table)
Network
2404405 - Disclosure - FAIR VALUE MEASUREMENTS (Changes in Fair Value) (Details)
(http://www.buckle.com/role/FairValueMeasurementsChangesInFairValueDetails)
TableFair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000885245 (http://www.sec.gov/CIK)
Measurement Frequency [Axis]Fair Value Measurements, Recurring [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]Period [Axis]
2016-01-31 - 2017-01-28
2015-02-01 - 2016-01-30
Investment Type [Axis]Investment Type [Axis]
Auction-rate securities [Member]Mutual funds [Member]Investment Type Categorization [Domain]Auction-rate securities [Member]Mutual funds [Member]Investment Type Categorization [Domain]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
 
 
 
 
 
 
Balance, Level 3 securities, beginning of year
7,265,000  
0  
7,265,000  
7,186,000  
0  
7,186,000  
Realized gains (losses) on Level 3 securities included in net income
(45,000) 
0  
(45,000) 
   
Unrealized gains (losses) on Level 3 securities included in other comprehensive income
385,000  
0  
385,000  
154,000  
0  
154,000  
Sales of Level 3 securities
(5,980,000) 
0  
(5,980,000) 
(75,000) 
0  
(75,000) 
Balance, Level 3 securities, end of year
1,625,000  
 
0  
 
1,625,000  
 
7,265,000  
 
0  
 
7,265,000