Business Segments (Schedule Of Revenue From External Customers, By Geographical Areas) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	$ 674,772	$ 717,194	$ 562,397
Europe (including former Soviet Union)
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	753	24,857	7,107
Far East
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	36,965	14,865	17,172
Middle East and Africa
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	86,470	79,781	46,304
North, Central and South America (excluding U.S.)
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	145,470	184,935	112,949
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	$ 405,114	$ 412,756	$ 378,865