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Pension Plans and Other Retirement Benefits - Components of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands |  |  | 3 Months Ended | 4 Months Ended | 8 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2016 | Nov. 03, 2018 | Jan. 28, 2017 | Feb. 02, 2019 | Jan. 28, 2017 | Sep. 30, 2018 | Sep. 30, 2016 | Nov. 03, 2018 | Feb. 02, 2019 | Feb. 03, 2018 | Jan. 28, 2017
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Settlement charge |  |  |  | $ 31,173 |  |  |  |  |  | $ 36,122 | $ 0 | $ 31,173
Expected rate of return on plan assets |  | 6.50% |  |  |  |  |  |  |  |  | 6.00% |
Rate of compensation increase |  | 4.80% |  |  |  |  |  |  |  |  | 3.80% |
Funded Plan |  |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  |  |  |  |  |  |  |  |  | 45,342 | $ 46,845 | 45,440
Interest cost |  |  |  |  |  |  |  |  |  | 54,355 | 55,301 | 56,094
Expected return on plan assets |  |  |  |  |  |  |  |  |  | (79,190) | (69,345) | (70,535)
Amortization of prior service cost |  |  |  |  |  |  |  |  |  | 377 | 377 | 377
Amortization of net actuarial loss |  |  |  |  |  |  |  |  |  | 12,250 | 21,557 | 31,397
Settlement charge |  |  | $ 36,122 |  |  |  |  |  |  | 36,122 | 0 | 31,173
Total expense |  |  |  |  |  |  |  |  |  | 69,256 | 54,735 | 93,946
Net (gain) loss |  |  |  |  |  |  |  |  |  | 68,770 | (38,293) | 17,894
Amortization of net (loss) |  |  |  |  |  |  |  |  |  | (12,250) | (21,557) | (31,397)
Settlement charge |  |  |  |  |  |  |  |  |  | (36,122) | 0 | (31,173)
Amortization of prior service cost |  |  |  |  |  |  |  |  |  | (377) | (377) | (377)
Total recognized in other comprehensive income (loss) |  |  |  |  |  |  |  |  |  | 20,021 | (60,227) | (45,053)
Total recognized in net periodic benefit cost and other comprehensive income (loss) |  |  |  |  |  |  |  |  |  | $ 89,277 | $ (5,492) | $ 48,893
Discount rate |  |  |  |  | 4.40% | 3.80% | 4.00% | 4.80% |  |  | 4.40% |
Expected rate of return on plan assets | 6.00% |  |  |  | 6.00% | 6.00% | 6.00% | 6.50% | 6.00% |  | 6.00% |
Rate of compensation increase |  |  |  |  |  |  |  |  |  | 4.00% | 4.00% | 4.00%
Unfunded Plan |  |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  |  |  |  |  |  |  |  |  | $ 2,391 | $ 1,888 | $ 1,835
Interest cost |  |  |  |  |  |  |  |  |  | 3,600 | 3,316 | 3,391
Amortization of net actuarial loss |  |  |  |  |  |  |  |  |  | 3,409 | 2,852 | 3,349
Total expense |  |  |  |  |  |  |  |  |  | 9,400 | 8,056 | 8,575
Net (gain) loss |  |  |  |  |  |  |  |  |  | 5,955 | 4,580 | 740
Amortization of net (loss) |  |  |  |  |  |  |  |  |  | (3,409) | (2,852) | (3,349)
Total recognized in other comprehensive income (loss) |  |  |  |  |  |  |  |  |  | 2,546 | 1,728 | (2,609)
Total recognized in net periodic benefit cost and other comprehensive income (loss) |  |  |  |  |  |  |  |  |  | $ 11,946 | $ 9,784 | $ 5,966
Discount rate |  |  |  |  |  |  |  |  |  | 3.80% | 4.00% | 4.20%
Rate of compensation increase |  |  |  |  |  |  |  |  |  | 6.00% | 6.00% | 6.00%

X
- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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- Definition Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income from prior service cost (credit) of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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- Definition Amount of cost recognized for passage of time related to defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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