Share Capital, Option Plans And Share-Based Payments (Narrative) (Details) (USD $)	0 Months Ended	1 Months Ended	3 Months Ended		12 Months Ended
	Nov. 23, 2012	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Purchased for Award					0	221,081	264,834
Payments for Repurchase of Common Stock					$ 0	$ 10,888,000	$ 12,499,000
Number of shares issued from treasury stock (in shares)	182,616			0
Dividends declared per Common Share		$ 0.30			$ 0.3	$ 0	$ 0
Number of options outstanding (in shares)		1,805,391.000		2,147,151	1,805,391.000	2,147,151	2,277,733
Unrecognized compensation cost relating to unvested stock awards		17,100,000			17,100,000
Unvested stock awards compensation cost, weighted average recognition period					3 years 2 months 1 day
Cash proceeds from exercise of options granted					14,200,000	19,200,000	10,100,000
Tax benefit realized from exercise of options					1,300,000	3,700,000	2,800,000
Issuance of treasury stock			8,300,000		0
Stock Options [Member]
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]
Number of options outstanding (in shares)		1,805,391			1,805,391
Common shares available for issuance (in shares)		2,652,250			2,652,250
Vesting period					4 years	4 years	4 years
Expire period of options, minimum term					7 years	7 years	7 years
Expire period of options, maximum term					10 years	10 years	10 years
Employee Share Purchase Plan [Member]
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]
Cash received from employee stock purchase plan					$ 2,100,000	$ 2,100,000	$ 1,400,000