Commitment and Contingencies (Details Textual) (USD $)	12 Months Ended
Jan. 31, 2013	Jan. 31, 2012
Commitment and Contingencies Disclosure (Additional Textual) [Abstract]
Long-term Debt	$ 410,042,000	$ 442,765,000
Debt Instrument, Maturity Date	Mar. 10, 2016
Senior subordinated notes maturity period	10 years
Long-term debt, maturity date	2016-03
Unrecognized tax benefits	3,500,000	4,600,000
Operating Lease Obligations [Member] \| Maximum [Member]
Commitment and Contingencies Disclosure (Textual) [Abstract]
Operating lease agreement expire period	2018
Operating Lease Obligations [Member] \| Minimum [Member]
Commitment and Contingencies Disclosure (Textual) [Abstract]
Operating lease agreement expire period	2013
2016 Tranche B term loans: due March 10, 2016, three-month LIBOR plus 4.00% with a 1.00% LIBOR floor [Member]
Commitment and Contingencies Disclosure (Textual) [Abstract]
Debt instrument annual rate	5.00%
Commitment and Contingencies Disclosure (Additional Textual) [Abstract]
Long-term Debt	117,399,000
2016 Extended term loans: due March 10, 2016, three-month LIBOR plus 4.00% [Member]
Commitment and Contingencies Disclosure (Textual) [Abstract]
Debt instrument annual rate	4.21%
Commitment and Contingencies Disclosure (Additional Textual) [Abstract]
Long-term Debt	191,101,000	191,101,000
2015 Extended revolving term credit facility due March 10, 2015 at the annual rate of 0.375% [Member]
Commitment and Contingencies Disclosure (Textual) [Abstract]
Debt instrument annual rate	0.375%
Senior Subordinated Notes: due March 15, 2016, 10.375% [Member]
Commitment and Contingencies Disclosure (Textual) [Abstract]
Debt instrument annual rate	10.375%
Commitment and Contingencies Disclosure (Additional Textual) [Abstract]
Long-term Debt	$ 101,542,000	$ 134,265,000
Debt Instrument, Maturity Date	Mar. 15, 2016

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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This element represents the total of accruals as of the date of the statement of financial position for interest recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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