Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data	Jul. 31, 2011	Jan. 31, 2011
Condensed Consolidated Balance Sheets
Accounts receivable, allowance	$ 9,175	$ 13,237
Common stock, par value	$ 0.10	$ 0.10
Common stock, shares authorized	600,000,000	600,000,000
Common stock, shares issued	205,636,586	204,937,882
Common stock, shares outstanding	205,033,176	204,533,916
Treasury stock, shares	603,410	403,966