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Pension and Other Postretirement Plans | 6 Months Ended
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Apr. 30, 2018
Compensation And Retirement Disclosure [Abstract] |
Pension and Other Postretirement Plans |
6. | Pension and other postretirement plans
The components of net periodic pension cost for the three and six months ended April 30, 2018 and April 30, 2017 were:
|  | U.S. |  |  | International |
Three Months Ended |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Service cost |  | $ | 3,054 |  |  | $ | 3,184 |  |  | $ | 528 |  |  | $ | 625 |
Interest cost |  |  | 3,658 |  |  |  | 3,243 |  |  |  | 424 |  |  |  | 419 |
Expected return on plan assets |  |  | (5,489 | ) |  |  | (5,265 | ) |  |  | (393 | ) |  |  | (358 | )
Amortization of prior service cost (credit) |  |  | (3 | ) |  |  | 11 |  |  |  | (83 | ) |  |  | (76 | )
Amortization of net actuarial loss |  |  | 2,550 |  |  |  | 2,457 |  |  |  | 548 |  |  |  | 662 |
Total benefit cost |  | $ | 3,770 |  |  | $ | 3,630 |  |  | $ | 1,024 |  |  | $ | 1,272 |
|  | U.S. |  |  | International |
Six Months Ended |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Service cost |  | $ | 6,875 |  |  | $ | 6,243 |  |  | $ | 1,038 |  |  | $ | 1,159 |
Interest cost |  |  | 7,159 |  |  |  | 6,454 |  |  |  | 833 |  |  |  | 768 |
Expected return on plan assets |  |  | (10,981 | ) |  |  | (10,443 | ) |  |  | (773 | ) |  |  | (643 | )
Amortization of prior service cost (credit) |  |  | (11 | ) |  |  | 23 |  |  |  | (162 | ) |  |  | (147 | )
Amortization of net actuarial loss |  |  | 4,706 |  |  |  | 4,785 |  |  |  | 1,077 |  |  |  | 1,261 |
Total benefit cost |  | $ | 7,748 |  |  | $ | 7,062 |  |  | $ | 2,013 |  |  | $ | 2,398 |
The components of other postretirement benefit cost for the three and six months ended April 30, 2018 and April 30, 2017 were:
|  | U.S. |  |  | International |
Three Months Ended |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Service cost |  | $ | 152 |  |  | $ | 154 |  |  | $ | 5 |  |  | $ | 5 |
Interest cost |  |  | 650 |  |  |  | 565 |  |  |  | 5 |  |  |  | 5 |
Amortization of prior service credit |  |  | (25 | ) |  |  | (41 | ) |  |  | — |  |  |  | — |
Amortization of net actuarial (gain) loss |  |  | 296 |  |  |  | 205 |  |  |  | (5 | ) |  |  | (4 | )
Total benefit cost |  | $ | 1,073 |  |  | $ | 883 |  |  | $ | 5 |  |  | $ | 6 |
|  | U.S. |  |  | International |
Six Months Ended |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Service cost |  | $ | 373 |  |  | $ | 376 |  |  | $ | 10 |  |  | $ | 9 |
Interest cost |  |  | 1,278 |  |  |  | 1,152 |  |  |  | 10 |  |  |  | 10 |
Amortization of prior service credit |  |  | (50 | ) |  |  | (82 | ) |  |  | — |  |  |  | — |
Amortization of net actuarial (gain) loss |  |  | 545 |  |  |  | 434 |  |  |  | (10 | ) |  |  | (8 | )
Total benefit cost |  | $ | 2,146 |  |  | $ | 1,880 |  |  | $ | 10 |  |  | $ | 11 |

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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