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Retirement Plans (Tables)
9 Months Ended
Feb. 28, 2017
Retirement Plan Tables [Abstract]  
Schedule of Retirement Plan Costs

 

 

 

Three Months Ended

 

 

Nine Months Ended

 

 

 

2017

 

 

2016

 

 

2017

 

 

2016

 

Defined benefit pension plans

 

$

57

 

 

$

53

 

 

$

173

 

 

$

160

 

Defined contribution plans

 

 

117

 

 

 

104

 

 

 

348

 

 

 

304

 

Postretirement healthcare plans

 

 

19

 

 

 

20

 

 

 

57

 

 

 

61

 

 

 

$

193

 

 

$

177

 

 

$

578

 

 

$

525

 

 

Schedule of Net Periodic Benefit Cost

 

 

Three Months Ended

 

 

Nine Months Ended

 

 

 

2017

 

 

2016

 

 

2017

 

 

2016

 

Pension Plans

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

    Service cost

 

$

180

 

 

$

166

 

 

$

540

 

 

$

497

 

    Interest cost

 

 

293

 

 

 

295

 

 

 

879

 

 

 

885

 

    Expected return on plan assets

 

 

(384

)

 

 

(377

)

 

 

(1,156

)

 

 

(1,131

)

    Amortization of prior service credit and other

 

 

(32

)

 

 

(31

)

 

 

(90

)

 

 

(91

)

 

 

$

57

 

 

$

53

 

 

$

173

 

 

$

160

 

 

 

 

Three Months Ended

 

 

Nine Months Ended

 

 

 

2017

 

 

2016

 

 

2017

 

 

2016

 

Postretirement Healthcare Plans

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

    Service cost

 

$

9

 

 

$

10

 

 

$

27

 

 

$

30

 

    Interest cost

 

 

10

 

 

 

10

 

 

 

30

 

 

 

31

 

 

 

$

19

 

 

$

20

 

 

$

57

 

 

$

61

 

 

Schedule of Pension Plans Contributions

 

 

 

2017

 

 

2016

 

Required

 

$

444

 

 

$

8

 

Voluntary

 

 

1,306

 

 

 

487

 

 

 

$

1,750

 

 

$

495