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Summary of Fair Value and Carrying Value of Notes Payable (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2013	Jan. 31, 2013
Disclosure Summary Of Fair Value And Carrying Value Of Notes Payable [Abstract]
Fair value of notes payable	$ 300,438	$ 293,867
Carrying value of notes payable	$ 219,937	$ 218,546

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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