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VALUATION AND QUALIFYING ACCOUNTS | 12 Months Ended
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Apr. 30, 2012
VALUATION AND QUALIFYING ACCOUNTS | SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS April 30, 2012
Column A |  | Column B |  |  | Column C |  |  | Column D |  |  | Column E |
|  |  |  |  | Additions |  |  |  |  |  |  |
Description |  | Balance at Beginning of Period |  |  | Charges to Cost and Expenses |  |  | Charges to Other Accounts(1) |  |  | Deductions(2) |  |  | Balance at End of Period |
|  | (in thousands) |
Allowance for doubtful accounts: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year Ended April 30, 2012 |  | $ | 9,977 |  |  | $ | 5,732 |  |  | $ | (220 | ) |  | $ | (6,052 | ) |  | $ | 9,437 |
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 |
Deferred tax asset valuation allowance: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year Ended April 30, 2012 |  | $ | 26,168 |  |  | $ | 443 |  |  | $ | — |  |  | $ | (1,522 | ) |  | $ | 25,089 |
Year Ended April 30, 2011 |  | $ | 21,037 |  |  | $ | 15,689 |  |  | $ | — |  |  | $ | (10,558 | ) |  | $ | 26,168 |
Year Ended April 30, 2010 |  | $ | 15,097 |  |  | $ | 5,940 |  |  | $ | — |  |  | $ | — |  |  | $ | 21,037 |
(1) | Exchange rate fluctuations.
(2) | Allowance for doubtful accounts represents accounts written-off, net of recoveries and deferred tax asset valuation represents release of prior valuation allowances.

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- Definition The entire disclosure for 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration