Property and Equipment - Narrative (Details) (USD $)	3 Months Ended		9 Months Ended						9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Construction in Progress, Newbuild Drilling Units drilling_unit	Jan. 31, 2014 Standard Jackup Drilling Unit	Apr. 30, 2014 Semisubmersible Tender Assist Drilling Rig	Mar. 31, 2014 Semisubmersible Tender Assist Drilling Rig	Jun. 30, 2014 Capital Addition Purchase Commitments Construction in Progress, Newbuild Drilling Units
Property, Plant and Equipment
Interest capitalized	$ 6,700,000	$ 8,200,000	$ 22,900,000	$ 23,700,000
Expenditure towards construction of drilling units currently under construction					555,000,000
Number of drilling units					3
Commitments on drilling units under construction									1,200,000,000
Sales price						55,400,000	4,000,000
Carrying value of equipment and related inventory						$ 20,500,000		$ 2,000,000