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RETIREMENT PLANS | 3 Months Ended
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Dec. 31, 2019
RETIREMENT PLANS |
RETIREMENT PLANS | 12. RETIREMENT PLANS A summary of net periodic benefit expense for the Company’s defined benefit plans for the three-month periods ended December 31, 2019 and 2018 is shown in the following table. Net periodic benefit cost for each period presented is comprised of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months
​ | ​ | Ended December 31,
(In thousands) |  | 2019 |  | 2018
Defined benefit plans | ​ | ​ |  | ​ | ​ |
Interest cost | ​ | $ | 824 |  | ​ | 875
Expected return on assets | ​ |  | (1,041) |  | ​ | (1,086)
Amortization of: | ​ |  | ​ |  | ​ |
Prior service cost | ​ |  | — |  | ​ | —
Actuarial loss | ​ |  | 543 |  |  | 487
Net periodic benefit cost | ​ | $ | 326 |  | ​ | 276
​

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