Retirement Benefit Plans (Details 5) - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Amounts recognized in the consolidated balance sheets are:
Asset Amount	$ 20,896	$ 22,110	$ 20,435
Level 1
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Level 2
Amounts recognized in the consolidated balance sheets are:
Asset Amount	18,851	20,008
Level 3
Amounts recognized in the consolidated balance sheets are:
Asset Amount	2,045	2,102	$ 1,999
Large value
Amounts recognized in the consolidated balance sheets are:
Asset Amount	487	629
Large value | Level 1
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Large value | Level 2
Amounts recognized in the consolidated balance sheets are:
Asset Amount	487	629
Large value | Level 3
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Large blend
Amounts recognized in the consolidated balance sheets are:
Asset Amount	9,268	10,626
Large blend | Level 1
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Large blend | Level 2
Amounts recognized in the consolidated balance sheets are:
Asset Amount	9,268	10,626
Large blend | Level 3
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Large growth
Amounts recognized in the consolidated balance sheets are:
Asset Amount	515	631
Large growth | Level 1
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Large growth | Level 2
Amounts recognized in the consolidated balance sheets are:
Asset Amount	515	631
Large growth | Level 3
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Mid blend
Amounts recognized in the consolidated balance sheets are:
Asset Amount	109	64
Mid blend | Level 1
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Mid blend | Level 2
Amounts recognized in the consolidated balance sheets are:
Asset Amount	109	64
Mid blend | Level 3
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Small blend
Amounts recognized in the consolidated balance sheets are:
Asset Amount	102	55
Small blend | Level 1
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Small blend | Level 2
Amounts recognized in the consolidated balance sheets are:
Asset Amount	102	55
Small blend | Level 3
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Foreign large blend
Amounts recognized in the consolidated balance sheets are:
Asset Amount	1,559	1,679
Foreign large blend | Level 1
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Foreign large blend | Level 2
Amounts recognized in the consolidated balance sheets are:
Asset Amount	1,559	1,679
Foreign large blend | Level 3
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Diversified emerging markets
Amounts recognized in the consolidated balance sheets are:
Asset Amount	35	83
Diversified emerging markets | Level 1
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Diversified emerging markets | Level 2
Amounts recognized in the consolidated balance sheets are:
Asset Amount	35	83
Diversified emerging markets | Level 3
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Inflation protected bond
Amounts recognized in the consolidated balance sheets are:
Asset Amount	489	562
Inflation protected bond | Level 1
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Inflation protected bond | Level 2
Amounts recognized in the consolidated balance sheets are:
Asset Amount	489	562
Inflation protected bond | Level 3
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Intermediate term bond
Amounts recognized in the consolidated balance sheets are:
Asset Amount	7,538	7,001
Intermediate term bond | Level 1
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Intermediate term bond | Level 2
Amounts recognized in the consolidated balance sheets are:
Asset Amount	5,493	4,899
Intermediate term bond | Level 3
Amounts recognized in the consolidated balance sheets are:
Asset Amount	2,045	2,102
High inflation bond
Amounts recognized in the consolidated balance sheets are:
Asset Amount	340	233
High inflation bond | Level 1
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
High inflation bond | Level 2
Amounts recognized in the consolidated balance sheets are:
Asset Amount	340	233
High inflation bond | Level 3
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Emerging markets bonds
Amounts recognized in the consolidated balance sheets are:
Asset Amount	56	226
Emerging markets bonds | Level 1
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Emerging markets bonds | Level 2
Amounts recognized in the consolidated balance sheets are:
Asset Amount	56	226
Emerging markets bonds | Level 3
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Short-term bonds
Amounts recognized in the consolidated balance sheets are:
Asset Amount	398	321
Short-term bonds | Level 1
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Short-term bonds | Level 2
Amounts recognized in the consolidated balance sheets are:
Asset Amount	398	321
Short-term bonds | Level 3
Amounts recognized in the consolidated balance sheets are:
Asset Amount	$ 0	$ 0