Litigation (Details) - WesternGeco [Member] $ in Millions		1 Months Ended					36 Months Ended
	Oct. 30, 2015	May. 31, 2014 USD ($)	Apr. 30, 2014 USD ($)	Oct. 31, 2013 USD ($)	Aug. 31, 2012 USD ($)	Jun. 30, 2009 Patent	Jul. 02, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)
Litigation (Textual) [Abstract]
Number of patent apparatus claims contained | Patent						4
Settled Litigation [Member]
Litigation (Textual) [Abstract]
Total damages awarded		$ 123.8	$ 9.4	$ 73.1	$ 105.9
Reduction in damages award in the case			$ (3.0)
Prejudgment interest expense accrued							$ 10.9
Accrual for loss contingency related to legal proceedings								$ 22.0	$ 124.0
Settled Litigation [Member] | Subsequent event [Member]
Litigation (Textual) [Abstract]
Number Of Days To Request Writ To Review Case	90 days
Settled Litigation [Member] | Lost Royalties [Member]
Litigation (Textual) [Abstract]
Total damages awarded					12.5
Settled Litigation [Member] | Lost Profits [Member]
Litigation (Textual) [Abstract]
Total damages awarded					$ 93.4