Earnings per Share (Detail) (USD $) In Thousands, except Per Share data	12 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2009
Earnings Per Share Disclosure [Line Items]
Net earnings used for basic and diluted earnings per share	$ 112,302	$ 109,776	$ 105,242
Weighted average shares used in basic computation	37,098	37,255	37,802
Dilutive stock options	74	92	98
Weighted average shares used in diluted computation	37,172	37,347	37,900
Basic EPS	$ 3.03	$ 2.95	$ 2.78
Diluted EPS	$ 3.02	$ 2.94	$ 2.78