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RETIREMENT PLANS | 9 Months Ended
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Jun. 30, 2019
RETIREMENT PLANS |
RETIREMENT PLANS | 11. RETIREMENT PLANS A summary of net periodic benefit expense for the Company’s defined benefit plans for the three and nine-month periods ended June 30, 2019 and 2018 is shown in the following table. Net periodic benefit cost for each period presented is comprised of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months | ​ | Nine Months
​ | ​ | Ended June 30, | ​ | Ended June 30,
(In thousands) |  | 2019 |  | 2018 |  | 2019 | ​ | 2018
Defined benefit plans | ​ | ​ |  | ​ |  | ​ |  | ​ |
Interest cost | ​ | $ | 875 |  | 821 |  | 2,626 |  | 2,461
Expected return on assets | ​ |  | (1,086) |  | (975) |  | (3,259) |  | (2,924)
Amortization of: | ​ |  | ​ |  |  |  | ​ |  |
Prior service cost | ​ |  | — |  | — |  | — |  | —
Actuarial loss | ​ |  | 487 |  | 548 |  | 1,461 |  | 1,644
Net periodic benefit cost | ​ | $ | 276 |  | 394 |  | 828 |  | 1,181
​

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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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