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 $) | 2-May-15 | Jan. 31, 2015 | 3-May-14 |
In Thousands, unless otherwise specified |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Deferred compensation plan | $9,125 | $8,461 | $7,279 |
Total | 59,412 | 135,360 | 103,924 |
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 | 9,125 | 8,461 | 7,279 |
Total | 10,965 | 10,201 | 15,200 |
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 | 48,447 | 125,159 | 88,724 |
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 | 3,078 | 16,663 | 35,961 |
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 | 3,078 | 16,663 | 35,961 |
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 | | 1,402 | 2,260 |
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 | | 1,402 | 2,260 |
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 |
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 |
U.S. Government Agencies [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Marketable securities | 14,303 | 26,299 | 6,009 |
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 | 14,303 | 26,299 | 6,009 |
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 | 29,068 | 79,202 | 46,754 |
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 | 29,068 | 79,202 | 46,754 |
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 | 1,998 | 2,995 | |
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 | 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 | 1,998 | 2,995 | |
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 | 0 | |
Money Market Accounts [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Cash equivalents | 1,840 | 338 | 5,661 |
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 | 1,840 | 338 | 5,661 |
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 |