Derivative Financial Instruments (Consolidated Statements of Operation and Statements of Comprehensive Income) (Details) (Designated as Hedging Instrument [Member], Cash Flow Hedging [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in AOCI on Derivative (Effective Portion)	$ (743)	$ (66)
Amount of Gain or (Loss) Reclassified from AOCI into Income (Effective Portion)	(381)	(438)
Interest expense, net of capitalized interest [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Reclassified from AOCI into Income (Effective Portion)	(354)	(438)
Contract drilling revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Reclassified from AOCI into Income (Effective Portion)	(27)	0
Interest rate swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in AOCI on Derivative (Effective Portion)	21	(66)
Foreign exchange forward currency contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in AOCI on Derivative (Effective Portion)	$ (764)	$ 0