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BORROWING ARRANGEMENTS (Details) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 31, 2021 USD ($) | Nov. 01, 2020 USD ($) | Oct. 31, 2021 USD ($) | Nov. 01, 2020 USD ($) | Aug. 22, 2021 USD ($) facility | Jan. 31, 2021 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Borrowings under revolving line of credit |  |  | $ 0 | $ 487,823,000 |  |
Outstanding letter of credit facilities | $ 7,542,000 |  | 7,542,000 |  |  |
Standby Letters of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amount issued but undrawn under credit facility | 11,919,000 |  | 11,919,000 |  |  |
Letter of Credit Facility Renewed and Extended |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Number of facilities | facility |  |  |  |  | 3 |
Maximum borrowing capacity of letter of credit after renewal |  |  |  |  | $ 35,000,000 |
Unsecured Revolving Line of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Current borrowing capacity | 500,000,000 |  | 500,000,000 |  |  |
Maximum borrowing capacity including additional borrowing capacity | 250,000,000 |  | 250,000,000 |  |  |
Borrowings under revolving line of credit | 0 | $ 0 | 0 | $ 487,823,000 |  |
Weighted average interest rate |  | 2.47% |  | 2.47% |  |
Unsecured Revolving Line of Credit | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Additional borrowing capacity | $ 750,000,000 |  | $ 750,000,000 |  |  |
Unsecured Revolving Line of Credit | Margin Based on Leverage Ratio | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Leverage ratio |  |  | 0.91% |  |  |
Unsecured Revolving Line of Credit | Margin Based on Leverage Ratio | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Leverage ratio |  |  | 1.775% |  |  |
Unsecured Revolving Line of Credit | Base Rate | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Leverage ratio |  |  | 0.00% |  |  |
Unsecured Revolving Line of Credit | Base Rate | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Leverage ratio |  |  | 0.775% |  |  |
Unsecured Term Loan Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount |  |  |  |  |  | $ 300,000,000

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