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Quarterly Financial Information (Narrative) (Details) - USD ($) $ in Thousands | Jul. 31, 2015 | Apr. 30, 2015 | Jan. 31, 2015 | Jul. 31, 2014
--- | --- | --- | --- | ---
Accounts receivable, less allowance | $ 460,027 |  |  | $ 474,157
Inventories, net | 264,955 |  |  | 253,351
Retained earnings | $ 815,166 |  |  | $ 702,435
Effect of Revision [Member] |  |  |  |
Accounts receivable, less allowance |  | $ 800 | $ 8,400 |
Inventories, net |  | 600 | 6,000 |
Retained earnings |  | $ 200 | $ 1,600 |

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