Property and Equipment - Narrative (Details) (USD $)	3 Months Ended		6 Months Ended					6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Construction in Progress, Newbuild Drilling Units drilling_unit	Jan. 31, 2014 Standard Jackup Drilling Unit	Mar. 31, 2014 Semisubmersible Tender Assist Drilling Rig	Mar. 31, 2014 Capital Addition Purchase Commitments Construction in Progress, Newbuild Drilling Units	Apr. 30, 2014 Subsequent Event Semisubmersible Tender Assist Drilling Rig
Property, Plant and Equipment
Interest capitalized	$ 6,400,000	$ 6,500,000	$ 16,200,000	$ 15,600,000
Expenditure towards construction of drilling units currently under construction					510,000,000
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