Business Segments (Schedule Of Revenue From External Customers, By Geographical Areas) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	$ 717,194	$ 562,397	$ 550,692
Europe (including former Soviet Union) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	24,857	7,107	25,174
Far East [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	14,865	17,172	24,998
Middle East and Africa [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	79,781	46,304	25,880
North, Central and South America (excluding U.S.) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	184,935	112,949	81,506
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	$ 412,756	$ 378,865	$ 393,134