Financial Information Relating to Operating Segments (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2010
Segment Reporting Information [Line Items]      
External sales $ 314,560 $ 289,962 $ 269,047
Earnings before income taxes 162,195 164,981 156,446
Goodwill 85,682 86,633 25,068
Intangible assets, net 46,476 52,282 2,044
Assets 719,324 617,670 518,816
Depreciation and amortization 12,467 8,700 8,130
Capital purchases 6,017 3,630 4,644
Biotechnology
      
Segment Reporting Information [Line Items]      
External sales 293,274 270,287 250,653
Earnings before income taxes 162,763 164,332 155,989
Goodwill 85,682 86,633 25,068
Intangible assets, net 46,476 52,282 2,044
Assets 529,392 505,087 400,112
Depreciation and amortization 10,920 7,165 5,411
Capital purchases 4,021 2,707 3,885
Hematology
      
Segment Reporting Information [Line Items]      
External sales 21,286 19,675 18,394
Earnings before income taxes 8,002 7,222 6,869
Goodwill 0 0 0
Intangible assets, net 0 0 0
Assets 22,135 21,046 18,543
Depreciation and amortization 411 417 340
Capital purchases 597 149 208
Reportable Segment
      
Segment Reporting Information [Line Items]      
Earnings before income taxes 170,765 171,554 162,858
Assets 551,527 526,133 418,655
Depreciation and amortization 11,331 7,582 5,751
Capital purchases 4,618 2,856 4,093
Unallocated Amount to Segment
      
Segment Reporting Information [Line Items]      
Earnings before income taxes (8,570) (6,573) (6,412)
Assets 167,797 91,537 100,161
Depreciation and amortization 1,136 1,118 2,379
Capital purchases $ 1,399 $ 774 $ 551