Stock Plans (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended	1 Months Ended			12 Months Ended					1 Months Ended			12 Months Ended					0 Months Ended	1 Months Ended		12 Months Ended	1 Months Ended	12 Months Ended	0 Months Ended	1 Months Ended			0 Months Ended	1 Months Ended
	Aug. 12, 2013	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2010	Jun. 30, 2013	Jun. 30, 2012 item	Jun. 30, 2011	Jun. 30, 2012 Stock Incentive Plans [Member] item	Jun. 30, 2013 2004 Incentive Plan [Member]	Nov. 30, 2012 2004 Director Plan [Member] item	Nov. 30, 2011 2004 Director Plan [Member] item	Nov. 30, 2010 2004 Director Plan [Member] item	Jun. 30, 2013 2004 Director Plan [Member]	Jun. 30, 2012 2004 Director Plan [Member] item	Jun. 30, 2012 2004 Stock Incentive Plan And 2010 Stock Award And Incentive Plan [Member] item	Jun. 30, 2013 2010 Plan [Member]	Jun. 30, 2013 Full Value Awards [Member] 2010 Plan [Member]	Aug. 09, 2011 Employee Stock Purchase Plan [Member]	May 31, 2013 Employee Stock Purchase Plan [Member]	Nov. 30, 2012 Employee Stock Purchase Plan [Member]	Jun. 30, 2013 Employee Stock Purchase Plan [Member]	Aug. 31, 2012 Restricted Stock Units [Member]	Jun. 30, 2013 Restricted Stock Units [Member]	Aug. 05, 2013 Service-Based Restricted Stock Units [Member]	Aug. 31, 2011 Service-Based Restricted Stock Units [Member]	Nov. 30, 2010 Service-Based Restricted Stock Units [Member]	Aug. 31, 2010 Service-Based Restricted Stock Units [Member]	Aug. 05, 2013 Special Restricted Stock Units [Member]	Aug. 31, 2012 Performance-Based Restricted Stock Units [Member]	Aug. 06, 2012 Performance-Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of plans						6		3						1	2
Number of shares authorized for grant awards									2,700,000				350,000			1,100,000	550,000
Attained retirement age causing acceleration of option exercisability													70 years
Shares remaining available for grant									8,203				86,000			866,201	438,534				898,053
Unrecognized compensation costs					$ 5.9
Weighted-average period which unrecognized compensation costs are to be recognized					3 years
Total aggregate compensation amount of options	1.4																											3.5
Stock options granted		72,700	95,500	171,700	90,100	119,500	211,300			17,400	24,000	39,600
Vesting period of options granted	3 years	3 years	3 years	3 years						3 years	3 years	3 years	3 years									3 years		3 years	3 years		3 years	3 years	3 years
Exercise price equal to closing price of common stock on date of grant		$ 45.95	$ 31.78	$ 16.15						$ 46.61	$ 33.19	$ 20.69
Weighted-average grant date fair value of options granted		$ 20.42	$ 14.51	$ 7.22	$ 20.47	$ 14.60	$ 7.58			$ 20.66	$ 14.93	$ 9.13										$ 45.95			$ 31.78	$ 21.07	$ 16.15		$ 45.95
Number of non-employees granted stock awards										6	6	6
Expiration period in which options granted expire	10 years	10 years	10 years	10 years						10 years	10 years	10 years
Discount on common stock available to employees for purchase																					15.00%
Issuance of common stock for employee stock purchase plan, shares																			30,240	36,483
Number of additional shares authorized for issuance																		1,000,000
Total aggregate compensation amount of restricted stock units																								$ 3.2						$ 1.0
Shares of service-based restricted stock or restricted stock units granted																						72,700	92,000		98,300	26,500	146,400		19,000
Shares determined to be eligilble for vesting																													6,111