Retirement Benefits (Schedule of Amounts Recognized in Balance Sheet and Other Comprehensive Income (Loss)) (Details) (USD $) In Thousands	Sep. 30, 2011	Sep. 30, 2010
Pension Plans, Defined Benefit [Member]
Amounts recognized in statement of financial position consist of:
Other non-current liabilities	$ (25,349)	$ (25,776)
Underfunded status at end of year	(25,349)	(25,776)
Amounts recognized in accumulated other comprehensive income consist of:
Unrecognized net prior service (benefit) cost	1,493	1,563
Unrecognized net (gains) losses	30,548	25,146
Total amounts recognized	32,041	26,709
Deferred taxes	(11,712)	(9,680)
Amounts recognized in accumulated other comprehensive income	20,329	17,029
United States Pension Plans of US Entity, Defined Benefit [Member]
Amounts recognized in statement of financial position consist of:
Other non-current liabilities	(16,361)	(12,658)
Underfunded status at end of year	(16,361)	(12,658)
Amounts recognized in accumulated other comprehensive income consist of:
Unrecognized net prior service (benefit) cost	1,517	1,593
Unrecognized net (gains) losses	16,769	9,183
Total amounts recognized	18,286	10,776
Deferred taxes	(6,949)	(4,095)
Amounts recognized in accumulated other comprehensive income	11,337	6,681
Foreign Pension Plans, Defined Benefit [Member]
Amounts recognized in statement of financial position consist of:
Other non-current liabilities	(8,988)	(13,118)
Underfunded status at end of year	(8,988)	(13,118)
Amounts recognized in accumulated other comprehensive income consist of:
Unrecognized net prior service (benefit) cost	(24)	(30)
Unrecognized net (gains) losses	13,779	15,963
Total amounts recognized	13,755	15,933
Deferred taxes	(4,763)	(5,585)
Amounts recognized in accumulated other comprehensive income	8,992	10,348
Other Postretirement Benefit Plans, Defined Benefit [Member]
Amounts recognized in statement of financial position consist of:
Accrued liabilities	(2,503)	(2,693)
Other non-current liabilities	(30,420)	(34,529)
Underfunded status at end of year	(32,923)	(37,222)
Amounts recognized in accumulated other comprehensive income consist of:
Unrecognized net prior service (benefit) cost	(1,501)	(2,372)
Unrecognized net (gains) losses	(2,272)	1,001
Total amounts recognized	(3,773)	(1,371)
Deferred taxes	1,437	530
Amounts recognized in accumulated other comprehensive income	$ (2,336)	$ (841)