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Pension Plans and Other Retirement Benefits - Additional Information (Detail) - USD ($) $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 4 Months Ended | 8 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Oct. 21, 2016 | Sep. 30, 2016 | Dec. 31, 2017 | 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 | Dec. 31, 2016
Pension Plans and Other Retirement Benefits [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net accrued liability recognized in balance sheet |  |  |  |  |  |  | $ 72,600 |  |  |  |  | $ 72,600 | $ 77,600 |  |
Pension plans and other retirement benefits, current liability |  |  |  |  |  |  | 4,700 |  |  |  |  | 4,700 | 2,400 |  |
Pension plans and other retirement benefits, long-term liability |  |  |  |  |  |  | 92,100 |  |  |  |  | 92,100 | 88,600 |  |
Pension plans and other retirement benefits, long-term asset |  |  |  |  |  |  | 24,200 |  |  |  |  | 24,200 | 13,400 |  |
Employer contribution |  |  |  |  |  |  |  |  |  |  |  | $ 106,200 | 105,000 | $ 54,600 |
Minimum percentage of pension liability |  |  |  |  |  |  |  |  |  |  |  | 80.00% |  |  |
Anticipated employer's contribution to fund current benefit and expense payments under the unfunded plan in fiscal 2019 |  |  |  |  |  |  | $ 4,800 |  |  |  |  | $ 4,800 |  |  |
Pension settlement charge |  |  |  |  |  | $ 31,173 |  |  |  |  |  | $ 36,122 | $ 0 | 31,173 |
Defined benefit plan, benefits paid |  | $ 103,200 |  |  |  |  |  |  |  |  |  |  |  |  |
Pension expense discount rate |  |  | 4.80% |  |  |  |  |  |  |  |  |  | 3.80% |  |
Expected rate of return on plan assets |  |  | 6.50% |  |  |  |  |  |  |  |  |  | 6.00% |  |
Percentage of employees contribution from eligible pay, maximum |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |
Rate of eligible pay for matching employee contributions |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |
Minimum range of rates for matching employee contributions |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |
Maximum range of rates for matching employee contributions |  |  |  |  |  |  |  |  |  |  |  | 75.00% |  |  |
Rate of defined pension plan |  |  |  |  |  |  | 25.00% |  |  |  |  | 25.00% |  |  |
Percentage of plan assets representing stock funds |  |  |  | 3.90% |  |  |  |  |  |  |  |  |  |  |
Multiemployer Pension Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension Plans and Other Retirement Benefits [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension contribution to National Retirement Fund |  |  |  |  |  |  |  |  |  |  |  | $ 18,500 | $ 16,300 | 14,500 |
Percentage of pension contribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00%
Retirement/Deferred Savings Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension Plans and Other Retirement Benefits [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employer contribution |  |  |  |  |  |  |  |  |  |  |  | $ 15,300 | 12,600 | 10,200 |
Funded Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension Plans and Other Retirement Benefits [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Excess percentage of projected benefit obligation for amortization of unrecognized gains and losses |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |
Deferral Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension Plans and Other Retirement Benefits [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate of defined pension plan |  |  |  |  |  |  | 2.00% |  |  |  |  | 2.00% |  |  |
Employee Savings Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension Plans and Other Retirement Benefits [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total cost to employer |  |  |  |  |  |  |  |  |  |  |  | $ 60,800 | 54,500 | 45,600 |
Nonqualified Savings Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension Plans and Other Retirement Benefits [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employer contribution |  |  |  |  |  |  |  |  |  |  |  | 6,000 | 6,300 | 5,800 |
Funded Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension Plans and Other Retirement Benefits [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net accrued liability recognized in balance sheet |  |  |  |  |  |  | $ 24,165 |  |  |  |  | 24,165 | 13,442 |  |
Estimated amortization of net actuarial loss for 2019 |  |  |  |  |  |  | $ 17,700 |  |  |  |  | 17,700 |  |  |
Estimated amortization of prior service cost for 2019 |  |  |  |  |  |  |  |  |  |  |  | 400 |  |  |
Employer contribution |  |  |  |  |  |  |  |  |  |  |  | 100,000 | 100,000 |  |
Transferred assets to plan |  |  |  |  |  |  |  |  |  |  | $ (207,400) |  |  |  |
Pension settlement charge |  |  |  |  | $ 36,122 |  |  |  |  |  |  | 36,122 | 0 | $ 31,173 |
Defined benefit plan, benefits paid |  |  |  |  |  |  |  |  |  |  |  | $ 33,226 | $ 30,993 |  |
Pension expense discount rate |  |  |  |  |  |  |  |  |  |  |  | 4.00% | 4.00% | 4.00% |
Expected rate of return on plan assets | 6.00% |  |  |  |  |  | 6.00% | 6.00% | 6.00% | 6.50% | 6.00% |  | 6.00% |  |
Unfunded Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension Plans and Other Retirement Benefits [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net accrued liability recognized in balance sheet |  |  |  |  |  |  | $ (96,759) |  |  |  |  | $ (96,759) | $ (91,047) |  |
Estimated amortization of net actuarial loss for 2019 |  |  |  |  |  |  | $ 3,700 |  |  |  |  | 3,700 |  |  |
Employer contribution |  |  |  |  |  |  |  |  |  |  |  | 6,234 | 5,046 |  |
Defined benefit plan, benefits paid |  |  |  |  |  |  |  |  |  |  |  | $ 6,234 | $ 5,046 |  |
Pension expense discount rate |  |  |  |  |  |  |  |  |  |  |  | 6.00% | 6.00% | 6.00% |

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- Details
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