Retirement Benefits (Tables)

12 Months Ended

Sep. 30, 2017

Defined Contribution Plan [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Costs of Retirement Plans

		Year Ended September 30,
	2017		2016		2015
Company costs	$	32,008	$	31,893	$	30,933

Defined Benefit Pension Plan [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Net Periodic Benefit Costs

	Year Ended September 30,
	United States						Other Countries						Total
	2017		2016		2015		2017		2016		2015		2017		2016		2015
Service cost	$	1,675	$	1,695	$	2,018	$	1,133	$	749	$	784	$	2,808	$	2,444	$	2,802
Interest cost		5,757		5,236		5,956		1,208		1,637		2,128		6,965		6,873		8,084
Expected return on plan assets		(10,529)		(10,140)		(10,647)		(2,605)		(2,659)		(3,032)		(13,134)		(12,799)		(13,679)
Amortization of:
Net losses		1,854		1,292		396		514		246		190		2,368		1,538		586
Net prior service (benefit) cost		383		384		383		-		-		-		383		384		383
Settlement costs		-		47		-		-		-		-		-		47		-
Net periodic (benefit) cost	$	(860)	$	(1,486)	$	(1,894)	$	250	$	(27)	$	70	$	(610)	$	(1,513)	$	(1,824)

Schedule of Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan

	At or for the Year Ended September 30,
	United States				Other Countries				Total
	2017		2016		2017		2016		2017		2016
Changes in projected benefit obligation:
Projected benefit obligation at beginning of year	$	160,892	$	145,870	$	72,057	$	62,231	$	232,949	$	208,101
Service cost		1,675		1,695		1,133		749		2,808		2,444
Interest cost		5,757		5,236		1,208		1,637		6,965		6,873
Net actuarial (gains) losses		(5,267)		17,786		(6,188)		17,190		(11,455)		34,976
Contribution by participants		55		47		14		20		69		67
Benefits paid		(5,676)		(9,789)		(2,235)		(2,656)		(7,911)		(12,445)
Plan amendments		3,694		-		-		-		3,694		-
Settlements		-		47		-		-		-		47
Foreign currency exchange rate changes		-		-		380		(7,114)		380		(7,114)
Projected benefit obligation at end of year	$	161,130	$	160,892	$	66,369	$	72,057	$	227,499	$	232,949
Changes in fair value of plan assets:
Fair value of plan assets at beginning of year	$	145,886	$	135,590	$	62,926	$	60,663	$	208,812	$	196,253
Actual return on plan assets		20,067		19,859		2,542		10,202		22,609		30,061
Contributions by the Company		-		226		671		773		671		999
Contributions by plan participants		55		47		14		20		69		67
Benefits paid		(5,676)		(9,789)		(2,235)		(2,656)		(7,911)		(12,445)
Settlements		-		(47)		-		-		-		(47)
Foreign currency exchange rate changes		-		-		462		(6,076)		462		(6,076)
Fair value of plan assets at end of year	$	160,332	$	145,886	$	64,380	$	62,926	$	224,712	$	208,812
Net underfunded status at end of year	$	(798)	$	(15,006)	$	(1,989)	$	(9,131)	$	(2,787)	$	(24,137)

Schedule of Accumulated Benefit Obligations In Excess of and Less Than Fair Value of Plan Assets

	Plans with accumulated benefit obligation in excess of plan assets				Plans with accumulated benefit obligation less than plan assets
	At September 30,				At September 30,
	2017		2016		2017		2016
Projected benefit obligation	$	(82,447)	$	(220,788)	$	(145,052)	$	(12,161)
Accumulated benefit obligation		(80,759)		(218,769)		(144,006)		(10,924)
Fair value of plan assets		77,036		196,800		147,676		12,012

Schedule of Amounts Recognized in Balance Sheet and Other Comprehensive Income (Loss)

	At or for the Year Ended September 30,
	United States				Other Countries				Total
	2017		2016		2017		2016		2017		2016
Amounts recognized in statement of financial position consist of:
Other non-current assets	$	1,726	$	-	$	897	$	-	$	2,623	$	-
Accrued liabilities		-		-		(3)		-		(3)		-
Other non-current liabilities		(2,524)		(15,006)		(2,883)		(9,131)		(5,407)		(24,137)
Net over/(under)funded status at end of year	$	(798)	$	(15,006)	$	(1,989)	$	(9,131)	$	(2,787)	$	(24,137)
Amounts recognized in accumulated other comprehensive income consist of:
Unrecognized net prior service (benefit) cost	$	7,169	$	3,857	$	-	$	-	$	7,169	$	3,857
Unrecognized net (gains) losses		17,023		33,682		14,198		20,795		31,221		54,477
Total amounts recognized		24,192		37,539		14,198		20,795		38,390		58,334
Deferred taxes		(9,224)		(14,305)		(5,016)		(7,303)		(14,240)		(21,608)
Amounts recognized in accumulated other comprehensive income	$	14,968	$	23,234	$	9,182	$	13,492	$	24,150	$	36,726

Schedule of Changes in Plan Assets and Benefit Obligations Recorded in Other Comprehensive Income (Loss)

	Year Ended September 30,
	United States				Other Countries				Total
	2017		2016		2017		2016		2017		2016
Accumulated other comprehensive losses at beginning of year	$	37,539	$	31,102	$	20,795	$	13,618	$	58,334	$	44,720
Net (gain) loss		(14,805)		8,160		(6,125)		9,646		(20,930)		17,806
Loss due to settlement or curtailment arising during the period		-		(47)		-		-		-		(47)
Amortization of:
Net losses		(1,854)		(1,292)		(515)		(246)		(2,369)		(1,538)
Prior service benefit (cost)		3,312		(384)		-		-		3,312		(384)
Foreign currency exchange rate changes		-		-		43		(2,223)		43		(2,223)
Accumulated other comprehensive losses at end of year	$	24,192	$	37,539	$	14,198	$	20,795	$	38,390	$	58,334

Schedule of Amounts Expected to be Amortized from Accumulated Other Comprehensive Income (Loss) and Reported as a Component of Net Periodic Benefit Cost During the Next Fiscal Year

	United States		Other Countries		Total
Prior service cost	$	709	$	-	$	709
Net actuarial losses		598		290		888

Schedule of Expected Benefit Payments

Year Ending September 30,	United States		Other Countries		Total
2018	$	6,251	$	2,225	$	8,476
2019		6,911		2,578		9,489
2020		7,521		2,183		9,704
2021		8,065		2,396		10,461
2022		8,524		2,257		10,781
2023 – 2027		48,075		12,802		60,877

Schedule of Allocation of Plan Assets, Actual and Target Allocations

	At September 30,
	2017				2016
	Percentage of Plan Assets	Target Allocation Ranges			Percentage of Plan Assets	Target Allocation Ranges
United States:
Asset Class
Equity Securities	64.6%	41.2%	-	81.2%	56.4%	40.8%	-	80.8%
Debt Securities	35.2%	28.8%	-	48.8%	39.0%	29.2%	-	49.2%
Other	0.2%	0.0%			4.6%	0.0%
	100.0%				100.0%
United Kingdom:
Asset Class
Equity Securities	46.1%	30.0%	-	60.0%	34.7%	25.0%	-	45.0%
Debt Securities	53.8%	45.0%	-	70.0%	65.2%	40.0%	-	80.0%
Other	0.1%	0.0%			0.1%	0.0%
	100.0%				100.0%
Japan:
Asset Class
Equity Securities	41.0%	36.0%	-	44.0%	40.0%	36.0%	-	44.0%
Debt Securities	58.1%	55.0%	-	63.0%	59.1%	55.0%	-	63.0%
Other	0.9%	0.0%	-	2.0%	0.9%	0.0%	-	2.0%
	100.0%				100.0%

Schedule of Allocation of Plan Assets, Fair Value Hierarchy

	At September 30, 2017
	Level 1				Level 2				Level 3
	United States		Other Countries		United States		Other Countries		United States		Other Countries		Total
Asset Category:
Cash and cash equivalents	$	291	$	167	$	-	$	-	$	-	$	-	$	458
Mutual funds:
U.S. corporate bond fund		56,388		-		-		-		-		-		56,388
U.S. equity large cap fund		54,140		-		-		-		-		-		54,140
International equity large cap growth fund		49,513		-		-		-		-		-		49,513
Pooled funds:
Japanese equity securities		-		-		-		2,487		-		-		2,487
International equity securities		-		-		-		2,260		-		-		2,260
Japanese fixed income securities		-		-		-		4,987		-		-		4,987
International fixed income securities		-		-		-		1,730		-		-		1,730
Global target return equity/bond fund		-		-		-		13,103		-		-		13,103
Index linked U.K. equity fund		-		-		-		4,940		-		-		4,940
Index linked international equity fund		-		-		-		6,285		-		-		6,285
Index linked U.K. corporate bonds fund		-		-		-		16,540		-		-		16,540
Index linked U.K.  government securities fund		-		-		-		4,980		-		-		4,980
Index linked U.K. long-term government securities fund		-		-		-		6,901		-		-		6,901
Total assets	$	160,332	$	167	$	-	$	64,213	$	-	$	-	$	224,712
	At September 30, 2016
	Level 1				Level 2				Level 3
	United States		Other Countries		United States		Other Countries		United States		Other Countries		Total
Asset Category:
Cash and cash equivalents	$	6,741	$	163	$	-	$	-	$	-	$	-	$	6,904
Mutual funds:
U.S. corporate bond fund		56,813		-		-		-		-		-		56,813
U.S. equity large cap fund		48,506		-		-		-		-		-		48,506
International equity large cap growth fund		33,834		-		-		-		-		-		33,834
Pooled funds:
Japanese equity securities		-		-		-		2,536		-		-		2,536
International equity securities		-		-		-		2,258		-		-		2,258
Japanese fixed income securities		-		-		-		5,321		-		-		5,321
International fixed income securities		-		-		-		1,777		-		-		1,777
Index linked U.K. equity fund		-		-		-		7,982		-		-		7,982
Index linked international equity fund		-		-		-		9,694		-		-		9,694
Index linked U.K. corporate bonds fund		-		-		-		16,180		-		-		16,180
Index linked U.K.  government securities fund		-		-		-		5,009		-		-		5,009
Index linked U.K. long-term government securities fund		-		-		-		11,998		-		-		11,998
Total assets	$	145,894	$	163	$	-	$	62,755	$	-	$	-	$	208,812

Other Postretirement Benefit Plans [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Actuarial Assumptions Used

	2017		2016		2015
Weighted-average discount rate used to determine benefit obligation at September 30	3.78	%	3.63	%	4.01	%
Weighted-average discount rate used to determine net periodic benefit cost for years ended September 30	3.63		4.01		4.40

Schedule of Net Periodic Benefit Costs

	Year Ended September 30,
	2017		2016		2015
Service cost	$	14	$	22	$	30
Interest cost		1,244		1,048		1,233
Amortization of:
Net (gains) losses		201		156		(73)
Net prior service benefit		(158)		(158)		(158)
Net periodic cost	$	1,301	$	1,068	$	1,032

Schedule of Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan

	Year Ended September 30,
	2017		2016
Changes in accumulated postretirement benefit obligation:
Accumulated postretirement benefit obligation at beginning of year	$	35,630	$	34,927
Service cost		14		22
Interest cost		1,244		1,048
Premiums paid by plan participants		1,365		1,299
Net actuarial (gains) losses		(2,049)		1,912
Benefits paid		(3,964)		(3,503)
Foreign currency exchange rate changes		12		(75)
Accumulated postretirement benefit obligation at end of year	$	32,252	$	35,630
Changes in fair value of plan assets:
Fair value of plan assets at beginning of year	$	-	$	-
Contributions by the company		2,599		2,204
Premiums paid by plan participants		1,365		1,299
Benefits paid		(3,964)		(3,503)
Fair value of plan assets at end of year	$	-	$	-
Funded status at end of year	$	(32,252)	$	(35,630)

Schedule of Amounts Recognized in Balance Sheet and Other Comprehensive Income (Loss)

	Year Ended September 30,
	2017		2016
Amounts recognized in statement of financial position consist of:
Accrued liabilities	$	(2,410)	$	(2,505)
Other non-current liabilities		(29,842)		(33,125)
Funded status at end of year	$	(32,252)	$	(35,630)
Amounts recognized in accumulated other comprehensive income consist of:
Unrecognized net prior service benefit	$	(160)	$	(318)
Unrecognized net losses		3,234		5,484
Total amounts recognized		3,074		5,166
Deferred taxes		(1,183)		(1,979)
Amounts recognized in accumulated other comprehensive income	$	1,891	$	3,187

Schedule of Changes in Plan Assets and Benefit Obligations Recorded in Other Comprehensive Income (Loss)

	Year Ended September 30,
	2017		2016
Accumulated other comprehensive losses at beginning of year	$	5,166	$	3,268
Net (gain) loss		(2,049)		1,912
Amortization of:
Net losses		(201)		(156)
Prior service benefit		158		158
Foreign currency exchange rate changes		-		(16)
Accumulated other comprehensive losses at end of year	$	3,074	$	5,166

Schedule of Health Care Cost Trend Rates

	2017		2016
Health care cost trend rate assumed for next year	6.75	%	7.00	%
Rate to which the cost trend rate is assumed to decline
(the ultimate trend rate)	5.00	%	5.00	%
Year that the rate reaches the ultimate trend rate	2025		2025

Schedule of Health Care Costs Sensitivity

	Change In Health Care Cost Trend Rate
	1% increase		1% decrease
Effect on projected fiscal year 2018 service and interest cost	$	113	$	(99)
Effect on accumulated postretirement benefit obligation at September 30, 2017		2,960		(2,605)

Schedule of Future Postretirement Company Contributions

Year Ending September 30,
2018	$	3,871
2019		3,890
2020		3,871
2021		3,852
2022		3,818
2023 – 2027		17,812

Multiemployer Plans, Pension [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Costs of Retirement Plans

		Year Ended September 30,
	2017		2016		2015
Company contributions	$	292	$	475	$	600

UNITED STATES | Defined Benefit Pension Plan [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Actuarial Assumptions Used

	2017		2016		2015
United States:
Weighted-average assumptions to determine benefit obligation at September 30:
Discount rate	3.80	%	3.65	%	4.39	%
Weighted-average assumptions to determine periodic benefit costs for years ended September 30:
Discount rate	3.65		4.39		4.40
Long-term rate of return on plan assets	7.38		7.62		7.62

UNITED KINGDOM | Defined Benefit Pension Plan [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Actuarial Assumptions Used

	2017		2016		2015
United Kingdom:
Weighted-average assumptions to determine benefit obligation at September 30:
Discount rate	2.56	%	2.28	%	3.75	%
Rate of compensation increase	3.60		3.40		3.40
Weighted-average assumptions to determine periodic benefit costs for years ended September 30:
Discount rate - service cost	2.33		3.86		4.10
Discount rate - interest cost	2.24		3.63		4.10
Rate of compensation increase	3.40		3.40		3.50
Long-term rate of return on plan assets	4.75		5.00		5.50

JAPAN | Defined Benefit Pension Plan [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Actuarial Assumptions Used

	2017		2016		2015
Japan:
Weighted-average assumptions to determine benefit obligation at September 30:
Discount rate	0.58	%	0.46	%	0.97	%
Rate of compensation increase	2.00		2.02		2.00
Weighted-average assumptions to determine periodic benefit costs for years ended September 30:
Discount rate - service cost	0.59		1.27		1.10
Discount rate - interest cost	0.45		0.59		1.10
Rate of compensation increase	2.02		2.00		2.00
Long-term rate of return on plan assets	2.50		3.00		3.00