Retirement Benefits (Tables)

6 Months Ended

Mar. 31, 2018

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Schedule of Estimated Remaining Cash Contributions

Retirement pension benefits:
United States	$	-
United Kingdom		219
Japan		-
Other postretirement benefits		2,636

Defined Benefit Pension Plan [Member]

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Schedule of Net Periodic Benefit Costs

	Three-Months Ended March 31,
	United States				Other Countries				Total
	2018		2017		2018		2017		2018		2017
Service cost	$	411	$	418	$	165	$	187	$	576	$	605
Interest cost		1,501		1,439		344		296		1,845		1,735
Expected return on plan assets		(2,903)		(2,633)		(717)		(638)		(3,620)		(3,271)
Amortization of:
Net actuarial loss		149		463		75		126		224		589
Prior service cost		178		96		-		-		178		96
Net periodic retirement pension benefit	$	(664)	$	(217)	$	(133)	$	(29)	$	(797)	$	(246)
Contributions paid	$	-	$	-	$	119	$	101	$	119	$	101
	Six-Months Ended March 31,
	United States				Other Countries				Total
	2018		2017		2018		2017		2018		2017
Service cost	$	822	$	837	$	323	$	379	$	1,145	$	1,216
Interest cost		3,002		2,878		673		592		3,675		3,470
Expected return on plan assets		(5,807)		(5,265)		(1,403)		(1,279)		(7,210)		(6,544)
Amortization of:
Net actuarial loss		299		927		147		253		446		1,180
Prior service cost		355		192		-		-		355		192
Net periodic retirement pension benefit	$	(1,329)	$	(431)	$	(260)	$	(55)	$	(1,589)	$	(486)
Contributions paid	$	-	$	-	$	431	$	466	$	431	$	466

Defined Contribution Plan [Member]

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Schedule of Costs of Retirement Plans

	Three-Months Ended				Six-Months Ended
	March 31,				March 31,
	2018		2017		2018		2017
Company costs	$	8,716	$	8,502	$	16,595	$	15,751

Other Postretirement Benefit Plans [Member]

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Schedule of Net Periodic Benefit Costs

	Three-Months Ended				Six-Months Ended
	March 31,				March 31,
	2018		2017		2018		2017
Service cost	$	2	$	3	$	4	$	7
Interest cost		291		311		583		622
Amortization of:
Net actuarial loss		24		51		48		101
Prior service benefit		(39)		(39)		(79)		(79)
Curtailment gain		-		-		(330)		-
Net periodic other postretirement cost	$	278	$	326	$	226	$	651
Contributions paid	$	1,009	$	804	$	1,235	$	1,419

Multiemployer Plans, Pension [Member]

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Schedule of Costs of Retirement Plans

	Three-Months Ended				Six-Months Ended
	March 31,				March 31,
	2018		2017		2018		2017
Company contributions	$	87	$	79	$	167	$	147