Fair Value Measurements (Financial Assets Valued On A Recurring Or Non-Recurring Basis, Based On The Priority Of The Inputs To The Valuation Technique) (Details) (USD $) | Nov. 01, 2014 | Feb. 01, 2014 | Nov. 02, 2013 |
In Thousands, unless otherwise specified |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' |
Deferred compensation plan | $8,085 | $6,299 | $6,246 |
Total | 134,848 | 129,810 | 220,772 |
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' |
Deferred compensation plan | 8,085 | 6,299 | 6,246 |
Total | 12,209 | 23,620 | 55,731 |
Significant Other Observable Inputs (Level 2) [Member] | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' |
Deferred compensation plan | 0 | 0 | 0 |
Total | 122,639 | 106,190 | 165,041 |
Significant Unobservable Inputs (Level 3) [Member] | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' |
Deferred compensation plan | 0 | 0 | 0 |
Total | 0 | 0 | 0 |
Municipal Securities [Member] | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' |
Marketable securities | 22,103 | 51,519 | 81,963 |
Municipal Securities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' |
Marketable securities | 0 | 0 | 0 |
Municipal Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' |
Marketable securities | 22,103 | 51,519 | 81,963 |
Municipal Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' |
Marketable securities | 0 | 0 | 0 |
U.S. Government Securities [Member] | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' |
Marketable securities | 1,403 | 9,812 | 32,194 |
U.S. Government Securities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' |
Marketable securities | 1,403 | 9,812 | 32,194 |
U.S. Government Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' |
Marketable securities | 0 | 0 | 0 |
U.S. Government Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' |
Marketable securities | 0 | 0 | 0 |
U.S. Government Agencies [Member] | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' |
Marketable securities | 20,313 | 9,020 | 9,013 |
U.S. Government Agencies [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' |
Marketable securities | 0 | 0 | 0 |
U.S. Government Agencies [Member] | Significant Other Observable Inputs (Level 2) [Member] | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' |
Marketable securities | 20,313 | 9,020 | 9,013 |
U.S. Government Agencies [Member] | Significant Unobservable Inputs (Level 3) [Member] | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' |
Marketable securities | 0 | 0 | 0 |
Corporate Bonds [Member] | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' |
Marketable securities | 49,225 | 45,651 | 74,065 |
Corporate Bonds [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' |
Marketable securities | 0 | 0 | 0 |
Corporate Bonds [Member] | Significant Other Observable Inputs (Level 2) [Member] | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' |
Marketable securities | 49,225 | 45,651 | 74,065 |
Corporate Bonds [Member] | Significant Unobservable Inputs (Level 3) [Member] | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' |
Marketable securities | 0 | 0 | 0 |
Commercial Paper [Member] | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' |
Marketable securities | 30,998 | ' | ' |
Commercial Paper [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' |
Marketable securities | 0 | ' | ' |
Commercial Paper [Member] | Significant Other Observable Inputs (Level 2) [Member] | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' |
Marketable securities | 30,998 | ' | ' |
Commercial Paper [Member] | Significant Unobservable Inputs (Level 3) [Member] | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' |
Marketable securities | 0 | ' | ' |
Money Market Accounts [Member] | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' |
Cash equivalents | 2,721 | 7,509 | 17,291 |
Money Market Accounts [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' |
Cash equivalents | 2,721 | 7,509 | 17,291 |
Money Market Accounts [Member] | Significant Other Observable Inputs (Level 2) [Member] | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' |
Cash equivalents | 0 | 0 | 0 |
Money Market Accounts [Member] | Significant Unobservable Inputs (Level 3) [Member] | ' | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' | ' |
Cash equivalents | $0 | $0 | $0 |