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Valuation and Qualifying Accounts | 12 Months Ended
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Apr. 30, 2011
Valuation And Qualifying Accounts [Abstract] |
Scheduel II - Valuation and Qualifying Accounts | SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS April 30, 2011
Column A |  | Column B |  |  | Column C |  |  | Column D |  |  | Column E |
|  |  |  |  | Additions |  |  |  |  |  |  |
|  | Balance at |  |  | Charges to |  |  | Charges to |  |  |  |  |  | Balance at |
|  | Beginning |  |  | Cost and |  |  | Other |  |  |  |  |  | End of |
Description |  | of Period |  |  | Expenses |  |  | Accounts(1) |  |  | Deductions(2) |  |  | Period |
|  |  |  |  |  |  |  | (In thousands) |  |  |  |  |  |  |
Allowance for doubtful accounts: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year Ended April 30, 2011 |  | $ | 5,983 |  |  | $ | 7,650 |  |  | $ | 413 |  |  | $ | (4,069 | ) |  | $ | 9,977 |
Year Ended April 30, 2010 |  | $ | 11,197 |  |  | $ | 3,340 |  |  | $ | (50 | ) |  | $ | (8,504 | ) |  | $ | 5,983 |
Year Ended April 30, 2009 |  | $ | 11,504 |  |  | $ | 9,127 |  |  | $ | 111 |  |  | $ | (9,545 | ) |  | $ | 11,197 |
Deferred tax asset valuation allowance: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year Ended April 30, 2011 |  | $ | 21,037 |  |  | $ | 15,689 |  |  | $ | — |  |  | $ | (10,558 | ) |  | $ | 26,168 |
Year Ended April 30, 2010 |  | $ | 15,097 |  |  | $ | 5,940 |  |  | $ | — |  |  | $ | — |  |  | $ | 21,037 |
Year Ended April 30, 2009 |  | $ | 7,399 |  |  | $ | 7,698 |  |  | $ | — |  |  | $ | — |  |  | $ | 15,097 |
(1) |  | Exchange rate fluctuations.
(2) |  | Allowance for doubtful accounts represents accounts written-off, net of recoveries and deferred tax asset valuation allowance represents release of prior valuation allowances.

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- Definition Valuation and Qualifying accounts. + Details
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- Definition An element designated to encapsulate the entire schedule of any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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