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Debt (Details 1) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2013	Jan. 31, 2013
Carrying Amount [Member] \| Tranche B Term Loans [Member]
Summary of estimated fair values of long-term debt obligations
Loans Payable, Fair Value Disclosure	$ 117,399	$ 117,399
Carrying Amount [Member] \| Extended Term Loans [Member]
Summary of estimated fair values of long-term debt obligations
Loans Payable, Fair Value Disclosure	191,101	191,101
Carrying Amount [Member] \| Senior Subordinated Notes [Member]
Summary of estimated fair values of long-term debt obligations
Notes Payable, Fair Value Disclosure	101,542	101,542
Fair Value [Member] \| Tranche B Term Loans [Member]
Summary of estimated fair values of long-term debt obligations
Loans Payable, Fair Value Disclosure	118,432	118,432
Fair Value [Member] \| Extended Term Loans [Member]
Summary of estimated fair values of long-term debt obligations
Loans Payable, Fair Value Disclosure	192,305	191,827
Fair Value [Member] \| Senior Subordinated Notes [Member]
Summary of estimated fair values of long-term debt obligations
Notes Payable, Fair Value Disclosure	$ 102,943	$ 103,959

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents notes payable as of the balance sheet date.

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