Annual report pursuant to Section 13 and 15(d)

Consolidated Balance Sheet Detail (Details Textual)

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Consolidated Balance Sheet Detail (Details Textual) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2011
Depreciation, Depletion and Amortization $ 4.7 $ 5.4 $ 6.2