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Retirement Benefits (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Sep. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Percentage of annual contribution equal to eligible prior year wages			5.00%
Common shares issued from treasury stock for benefit plans			$ 14,748	$ 14,846
Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
UK High Court Ruling Amendment					$ 601
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of years of service			2 years
Treasury Stock at Cost [Member]
Defined Benefit Plan Disclosure [Line Items]
Common shares issued from treasury stock for benefit plans, shares	124,000	158,000	124,000	158,000
Common shares issued from treasury stock for benefit plans	$ 14,748	$ 14,846	$ 5,328	$ 5,673

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Amount of increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)(7)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

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