Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Jun. 30, 2012
Cost:
Land	$ 7,505	$ 7,473
Buildings and improvements	125,783	123,257
Laboratory equipment	32,044	31,658
Office equipment	5,823	5,710
Property, Plant and Equipment, Gross, Total	171,155	168,098
Accumulated depreciation and amortization	(76,235)	(74,310)
Property and equipment, net	$ 94,920	$ 93,788