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Pension Plans and Other Retirement Benefits (Tables)
 9 Months Ended
Oct. 31, 2020
Retirement Benefits [Abstract]  
Financial Information Related to Funded Defined Benefit Pension Plan and Unfunded Supplemental Retirement Plan
Presented below is financial information relating to TJX’s funded defined benefit pension plan (“qualified pension plan” or “funded plan”) and its unfunded supplemental pension plan (“unfunded plan”) for the periods shown:
 Funded PlanUnfunded Plan
 Thirteen Weeks EndedThirteen Weeks Ended
In thousandsOctober 31,
2020		November 2,
2019		October 31,
2020		November 2,
2019
Service cost$12,512 $11,415 $404 $440 
Interest cost12,620 13,149 860 871 
Expected return on plan assets(22,264)(18,630)— — 
Amortization of net actuarial loss and prior service cost6,028 5,556 1,394 471 
Total expense$8,896 $11,490 $2,658 $1,782 
Funded PlanUnfunded Plan
Thirty-Nine Weeks EndedThirty-Nine Weeks Ended
In thousandsOctober 31,
2020		November 2,
2019		October 31,
2020		November 2,
2019
Service cost$37,592 $33,513 $1,822 $1,544 
Interest cost37,658 39,129 2,462 2,805 
Expected return on plan assets(66,748)(55,606)— — 
Amortization of net actuarial loss and prior service cost17,046 14,574 3,462 2,343 
Total expense$25,548 $31,610 $7,746 $6,692