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Retirement Plans | 6 Months Ended
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Oct. 31, 2017
Retirement Plans [Abstract] |
Retirement Plans | 12. Retirement Plans The components of net pension expense (income) for the Company's global defined benefit plans were as follows (in thousands):
|  | Three Months Ended October 31, |  |  | Six Months Ended October 31, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Service cost |  | $ | 242 |  |  | $ | 251 |  |  | $ | 472 |  |  | $ | 503 |
Interest cost |  |  | 6,346 |  |  |  | 6,506 |  |  |  | 12,598 |  |  |  | 13,704 |
Expected return on plan assets |  |  | (9,782 | ) |  |  | (8,656 | ) |  |  | (19,439 | ) |  |  | (18,031 | )
Net amortization of prior service cost |  |  | (23 | ) |  |  | (24 | ) |  |  | (48 | ) |  |  | (49 | )
Recognized net actuarial loss |  |  | 1,534 |  |  |  | 1,270 |  |  |  | 3,035 |  |  |  | 2,632 |
Pension plan actuarial loss |  |  | - |  |  |  | 8,842 |  |  |  | - |  |  |  | 8,842 |
Net pension expense (credit) |  | $ | (1,683 | ) |  | $ | 8,189 |  |  | $ | (3,382 | ) |  | $ | 7,601 |
Employer defined benefit pension plan contributions were $2.8 million and $3.0 million for the three months ended October 31, 2017 and 2016, respectively, and $5.6 million and $10.6 million for the six months ended October 31, 2017 and 2016, respectively. Contributions for employer defined contribution plans were approximately $3.0 million and $3.5 million for the three months ended October 31, 2017 and 2016, respectively, and $7.9 million and $8.4 million for the six months ended October 31, 2017 and 2016, respectively.

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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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