Pension and Retirement Benefits (Tables)

12 Months Ended

Sep. 30, 2018

Pension Plan and Retirement Benefits

Schedule of status of employee pension benefit plans and other postretirement benefit plans

	Defined Benefit				Postretirement
	Pension Plans				Health Care Benefits
	Year Ended				Year Ended
	September 30,				September 30,
	2017		2018		2017		2018
Change in Benefit Obligation:
Projected benefit obligation at beginning of year	$	337,338	$	310,803	$	125,117	$	117,424
Service cost		6,282		5,536		350		336
Interest cost		10,577		10,801		4,292		4,311
Actuarial losses		(27,246)		(19,756)		(8,072)		(10,395)
Benefits paid		(14,682)		(14,178)		(4,263)		(3,663)
Transfer to third-party insurance company		—		(13,576)		—		—
Administrative expenses		(1,466)		(1,350)		—		—
Projected benefit obligation at end of year	$	310,803	$	278,280	$	117,424	$	108,013
Change in Plan Assets:
Fair value of plan assets at beginning of year	$	207,963	$	224,094	$	—	$	—
Actual return on assets		25,475		18,501		—		—
Employer contributions		6,804		8,782		4,263		3,663
Benefits paid		(14,682)		(14,178)		(4,263)		(3,663)
Transfer to third-party insurance company		—		(13,576)		—		—
Administrative expenses		(1,466)		(1,350)		—		—
Fair value of plan assets at end of year	$	224,094	$	222,273	$	—	$	—
Funded Status of Plan:
Unfunded status	$	(86,709)	$	(56,007)	$	(117,424)	$	(108,013)

Schedule of amounts recognized in the consolidated balance sheets and amounts expected to be recognized from AOCI into the statement of operations in the following year

	Defined Benefit				Postretirement				Non-Qualified				All Plans
	Pension Plans				Health Care Benefits				Pension Plans				Combined
	September 30,				September 30,				September 30,				September 30,
	2017		2018		2017		2018		2017		2018		2017		2018
Accrued pension and postretirement benefits:
Current	$	—	$	—	$	(5,000)	$	(5,000)	$	(95)	$	(95)	$	(5,095)	$	(5,095)
Non-current		(86,709)		(56,007)		(112,424)		(103,013)		(682)		(621)		(199,815)		(159,641)
Accrued pension and postretirement benefits	$	(86,709)	$	(56,007)	$	(117,424)	$	(108,013)	$	(777)	$	(716)	$	(204,910)	$	(164,736)
Accumulated other comprehensive loss:
Net loss		66,819		38,808		35,286		21,891		—		—		102,105		60,699
Prior service cost		2,213		1,839		—		—		—		—		2,213		1,839
Total accumulated other comprehensive loss	$	69,032	$	40,647	$	35,286	$	21,891	$	—	$	—	$	104,318	$	62,538
Amounts expected to be recognized from AOCI into the statement of operations in the following year:
Amortization of net loss	$	4,910	$	1,464	$	2,999	$	1,487	$	—	$	—	$	7,909	$	2,951
Amortization of prior service cost		374		205		—		—		—		—		374		205
	$	5,284	$	1,669	$	2,999	$	1,487	$	—	$	—	$	8,283	$	3,156

Schedule of components of net periodic pension and postretirement benefit cost

	Defined Benefit Pension Plans
	Year Ended September 30,
	2016		2017		2018
Service cost	$	4,080	$	6,282	$	5,536
Interest cost		12,050		10,577		10,801
Expected return on assets		(14,380)		(14,419)		(15,157)
Amortization of prior service cost		808		808		374
Recognized actuarial loss		8,838		11,267		4,910
Net periodic cost	$	11,396	$	14,515	$	6,464

	Postretirement
	Health Care Benefits
	Year Ended September 30,
	2016		2017		2018
Service cost	$	232	$	350	$	336
Interest cost		4,595		4,292		4,311
Recognized actuarial loss		2,825		4,278		2,999
Net periodic cost	$	7,652	$	8,920	$	7,646

Schedule of assumptions used to determine actuarial present value of the projected pension benefit obligation and postretirement health care benefit obligation for the plans

	September 30,		September 30,
	2017		2018
Discount rate (postretirement health care)	3.75	%	4.13	%
Discount rate (U.S. pension plan)	3.63	%	4.00	%
Discount rate (U.K. pension plan)	2.50	%	2.80	%
Rate of compensation increase (U.S. pension plan only)	2.50	%	2.50	%

Schedule of assumptions used to determine net periodic pension and postretirement health care benefit costs for the plans

	Defined Benefit
	Pension and
	Postretirement Health
	Care Plans
	Year Ended
	September 30,
	2016		2017		2018
Discount rate (postretirement health care plan)	4.25	%	3.50	%	3.75	%
Discount rate (U.S. pension plan)	4.00	%	3.25	%	3.63	%
Discount rate (U.K. pension plan)	3.70	%	2.30	%	2.50	%
Expected return on plan assets (U.S. pension plan)	7.50	%	7.50	%	7.25	%
Expected return on plan assets (U.K. pension plan)	4.10	%	2.70	%	3.30	%
Rate of compensation increase (U.S. pension plan only)	3.50	%	3.50	%	2.50	%

Schedule of plan assets by level within the fair value hierarchy

	September 30, 2017
	Level 1
	Active		Level 2
	Markets for		Other
	Identical		Observable
	Assets		Inputs		NAV		Total
U.S. Pension Plan Assets:
U.S. common stock mutual funds	$	—	$	—	$	73,430	$	73,430
Common /collective funds
Bonds		—		—		81,702		81,702
U.S. common stock		—		—		32,784		32,784
International equity		—		—		16,341		16,341
Total U.S.	$	—	$	—	$	204,257	$	204,257
U.K. Plan Assets:
Equities	$	—	$	—	$	8,913	$	8,913
Bonds		—		—		7,750		7,750
Other		—		—		3,174		3,174
Total U.K.	$	—	$	—	$	19,837	$	19,837
Total pension plan assets	$	—	$	—	$	224,094	$	224,094

	September 30, 2018
	Level 1
	Active		Level 2
	Markets for		Other
	Identical		Observable
	Assets		Inputs		NAV		Total
U.S. Pension Plan Assets:
U.S. common stock mutual funds	$	—	$	—	$	72,947	$	72,947
Common /collective funds
Bonds		—		—		80,250		80,250
U.S. common stock		—		—		32,547		32,547
International equity		—		—		16,152		16,152
Total U.S.	$	—	$	—	$	201,896	$	201,896
U.K. Plan Assets:
Equities	$	—	$	—	$	8,150	$	8,150
Bonds		—		—		9,781		9,781
Other		—		—		2,446		2,446
Total U.K.	$	—	$	—	$	20,377	$	20,377
Total pension plan assets	$	—	$	—	$	222,273	$	222,273

Schedule of asset classes as a percent of total assets

Asset Class	Target(1)
Equity	60	%
Fixed Income	40	%
Real Estate and Other	—	%

⁽¹⁾ From time to time the Company may adjust the target allocation by an amount not to exceed 10%.

Schedule of expected benefit payments

			Postretirement
Fiscal Year Ending September 30	Pension		Health Care
2019	$	14,226	$	5,000
2020		14,768		5,000
2021		15,251		5,000
2022		15,790		5,000
2023		16,243		5,000
2024 - 2028 (in total)		85,854		25,000