v2.4.0.6

Overview and Basis of Presentation (Details Textual) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
	Oct. 31, 2012	Oct. 31, 2012
Summary of Significant Accounting Policies (Textual) [Abstract]
Net proceeds	$ 684,620,000	$ 684,620,000
Common Class A [Member] | IPO [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Issued and sold of common share		26.2
Offering price	$ 28.00	$ 28.00
Net proceeds		684,600,000
Underwriting discounts and commissions		44,000,000
Approximate other offering expenses		$ 4,000,000
Common Class B [Member] | IPO [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Number of shares issued upon conversion		98.0
Number of shares issued upon converted		42.1

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