Debt (Details) (USD $) In Millions, unless otherwise specified		0 Months Ended				0 Months Ended
	Jan. 31, 2013 Loan	Jan. 31, 2013 Loan Minimum	Jan. 31, 2013 Loan Maximum	Aug. 03, 2013 Term Loan	Jan. 31, 2013 Term Loan	Jan. 31, 2013 Term Loan November 20, 2012 to February 28, 2013	Jan. 31, 2013 Term Loan Thereafter through August 31, 2017	Jan. 31, 2013 Term Loan Adjusted annual LIBOR	Jan. 31, 2013 Term Loan Prime rate	Jan. 31, 2013 Term Loan 1 month LIBOR Minimum	Jan. 31, 2013 Revolver	Jan. 31, 2013 Revolver Adjusted annual LIBOR	Jan. 31, 2013 Revolver Prime rate	Jan. 31, 2013 Revolver 1 month LIBOR Minimum
Debt
Maximum borrowing capacity	$ 18.6										$ 2.0
Initial principal amount					16.6
Outstanding principal amount				15
Variable rate basis								Adjusted annual LIBOR	Prime rate	1 month LIBOR		Adjusted annual LIBOR	Prime rate	1 month LIBOR
Interest rate added to the reference rate (as a percent)								2.75%		2.50%		2.25%		2.50%
Interest rate subtracted from the reference rate (as a percent)									0.25%				0.25%
Equal monthly installments for repayment of loan						0.65	0.89
Upfront fee					$ 0.07
Monthly non-usage fee percentage											0.25%
Fixed charge coverage ratio to be maintained		1.2
Senior funded debt ratio			2.0