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Income taxes - Additional Information (Detail) | 12 Months Ended |  | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2011 USD ($) | Jun. 30, 2010 USD ($) | Jun. 30, 2009 USD ($) | Jun. 30, 2010 R&D Europe USD ($) | Jun. 30, 2010 R&D Europe GBP (£)
Income Taxes [Line Items] |  |  |  |  |
Federal statutory tax rate | 35.00% |  |  |  |
Open tax years by major tax jurisdiction | The Company files income tax returns in the U.S federal tax jurisdiction, the states of Minnesota, Massachusetts and California, and several jurisdictions outside the U.S. U.S. tax returns for 2008 and subsequent years remain open to examination by the tax authorities. The Company's major non-U.S. tax jurisdictions are the United Kingdom, France and Germany, which have tax years open to examination for 2007 and subsequent years, and China, which has calendar year 2011 open to examination. |  |  |  |
Dividend declared and paid to Company by subsidiary |  |  |  | $ 74,400,000 | £ 50,000,000
Foreign currency exchange transaction loss |  | 12,800,000 |  |  |
Foreign currency exchange transaction loss, reduction in income tax expense |  | 4,700,000 |  |  |
Undistributed earnings of Company's foreign subsidiaries | 112,000,000 |  |  |  |
Unrecognized tax benefits that would affect the effective tax rate if recognized | $ 3,000 | $ 5,000 | $ 6,000 |  |

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