Retirement Benefits (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
	Dec. 31, 2016	Jun. 30, 2017	Jun. 30, 2016
Value of Company Stock Contributed to Defined Contribution Benefit Plans		$ 14,014	$ 13,999
Treasury Stock Issued During Period, Shares, Employee Benefit Plans		199	317
United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit, Lump Sum Buyout Benefits Paid, Current Year	$ 670
Scenario, Forecast [Member] | United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit, Lump Sum Buyout Benefits Paid, Expected		$ 0
Total stockholders equity
Value of Company Stock Contributed to Defined Contribution Benefit Plans		14,014	$ 13,999
Treasury Stock at Cost [Member]
Value of Company Stock Contributed to Defined Contribution Benefit Plans		$ 7,513	$ 8,680
Treasury Stock Issued During Period, Shares, Employee Benefit Plans		199	317