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Income taxes - Additional Information (Detail) | 12 Months Ended |  | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2012 USD ($) | Jun. 30, 2010 USD ($) | Jun. 30, 2011 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% |  |  |  |
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 | 144,000,000 |  |  |  |
Unrecognized tax benefits that would affect the effective tax rate if recognized | $ 2,000 | $ 5,000 | $ 3,000 |  |

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- Definition The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 47 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330036-122817 + Details
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