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Income taxes - Additional Information (Detail) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Jun. 30, 2014 USD ($) | Jun. 30, 2013 R&D Europe USD ($) | Jun. 30, 2013 R&D Europe GBP (£)
Income Taxes [Line Items] |  |  |
Federal statutory tax rate | 35.00% |  |
Dividend declared and paid to Company by subsidiary |  | $ 30.7 | £ 20.0
Undistributed earnings of Company's foreign subsidiaries | $ 174 |  |

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: 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 2: 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=34349781&loc=d3e330036-122817 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 + Details
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