Summary of Significant Accounting Policies (Details) (USD $)	12 Months Ended
	Jan. 31, 2013 Project
Summary of Significant Accounting Policies (Additional Textual) [Abstract]
Number of variable interest entities	2
Amount of unapproved change orders	1,141,000
Maximum [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Estimated useful lives of the assets	39 years
Minimum [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Estimated useful lives of the assets	5 years