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Information Regarding Operations in Reportable Segments (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 4 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jan. 14, 2017 | Jul. 14, 2018 | Jul. 15, 2017 | Apr. 21, 2018 | Apr. 22, 2017 | Jul. 14, 2018 | Jul. 15, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Sales |  |  | $ 941,283 | $ 926,639 |  |  | $ 2,147,736 | $ 2,114,288
Gain on divestiture |  | $ 28,875 |  |  |  | $ 28,900 |  | 28,875
Multi-employer pension plan withdrawal costs |  |  |  |  |  |  | 2,322 |
Loss on inferior ingredients |  |  | 3,884 |  |  |  | 3,884 |
Restructuring charges |  |  | 801 |  |  |  | 2,060 |
Impairment of assets |  |  |  |  | $ 2,500 |  | 2,483 |
Depreciation and amortization |  |  | 35,098 | 34,128 |  |  | 79,287 | 81,316
Income from operations |  |  | 52,264 | 68,723 |  |  | 128,879 | 166,925
Interest expense |  |  | (8,214) | (8,436) |  |  | (19,210) | (20,061)
Interest income |  |  | 6,466 | 5,158 |  |  | 14,561 | 11,735
Pension plan settlement loss |  |  | (1,035) |  | $ (4,668) |  | (5,703) |
Other components of net periodic pension and postretirement benefits credit |  |  | 298 | 1,443 |  |  | 1,033 | 3,366
Income before income taxes |  |  | 49,779 | 66,888 |  |  | 119,560 | 161,965
Operating Segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Gain on divestiture |  |  |  |  |  |  |  | 28,875
Unallocated Corporate Costs |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Restructuring charges |  |  | 58 |  |  |  | 86 |
Depreciation and amortization | [1] |  | 69 | 12 |  |  | 163 | (173)
Income from operations | [2] |  | (13,352) | (22,331) |  |  | (35,724) | (56,085)
DSD Segment |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Sales |  |  | 796,626 | 792,892 |  |  | 1,812,110 | 1,792,752
Loss on inferior ingredients |  |  | 3,884 |  |  |  |  |
DSD Segment | Operating Segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Sales |  |  | 818,998 | 806,296 |  |  | 1,860,367 | 1,825,212
Multi-employer pension plan withdrawal costs |  |  |  |  |  |  | 2,322 |
Loss on inferior ingredients |  |  | 3,884 |  |  |  | 3,884 |
Restructuring charges |  |  | 694 |  |  |  | 1,898 |
Impairment of assets |  |  |  |  |  |  | 2,483 |
Depreciation and amortization |  |  | 30,127 | 29,355 |  |  | 67,597 | 70,417
Income from operations |  |  | 54,481 | 79,465 |  |  | 138,906 | 166,726
DSD Segment | Intersegment Eliminations |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Sales |  |  | (22,372) | (13,404) |  |  | (48,257) | (32,460)
Warehouse Segment |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Sales |  |  | 144,657 | 133,747 |  |  | 335,626 | 321,536
Warehouse Segment | Operating Segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Sales |  |  | 187,078 | 173,844 |  |  | 432,891 | 411,521
Restructuring charges |  |  | 49 |  |  |  | 76 |
Depreciation and amortization |  |  | 4,902 | 4,761 |  |  | 11,527 | 11,072
Income from operations |  |  | 11,135 | 11,589 |  |  | 25,697 | 56,284
Warehouse Segment | Intersegment Eliminations |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Sales |  |  | $ (42,421) | $ (40,097) |  |  | $ (97,265) | $ (89,985)
[1] | Represents costs allocated to the company’s corporate head office.
[2] | Represents costs allocated to the company’s corporate head office and pension plan settlement loss.

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