Share Capital, Option Plans And Share-Based Payments (Narrative) (Details) (USD $)	3 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2013
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]
Share-based compensation expense	$ 4,612,000	$ 3,102,000
Share-based Compensation Arrangement by Share-based Payment Award, Shares Purchased for Award	0	0
Number of shares issued from treasury stock (in shares)	0	0
Dividends declared per Common Share	$ 0.30	$ 0
Number of options outstanding (in shares)	1,805,721.000		1,805,391
Unrecognized compensation cost relating to unvested stock awards	17,400,000
Unvested stock awards compensation cost, weighted average recognition period	3 years 0 months 18 days
Cash proceeds from exercise of options granted	1,200,000	3,400,000
Tax benefit realized from exercise of options	100,000	800,000
Stock Options [Member]
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]
Share-based compensation expense	1,357,000	1,339,000
Number of options outstanding (in shares)	1,805,721
Common shares available for issuance (in shares)	2,609,749
Vesting period	4 years	4 years
Expire period of options, minimum term	7 years	7 years
Expire period of options, maximum term	10 years	10 years
Performance Stock Units (PSUs) [Member]
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]
Share-based compensation expense	2,168,000	1,414,000
Deferred Stock Units [Member]
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]
Share-based compensation expense	267,000	188,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	243	299
Restricted Stock Awards [Member]
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]
Share-based compensation expense	0	10,000
Employee Share Purchase Plan [Member]
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]
Cash received from employee stock purchase plan	$ 700,000	$ 600,000

Cash collected to be used to purchase Common Stock in future periods

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- Definition

Common Stock, Shares, Issued from Treasury Stock

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Award Expire Period, Maximum

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Award Expire Period, Minimum

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

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- Definition

Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

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- Definition

Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

+ References

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-Publisher FASB

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-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

Number of options outstanding, including both vested and non-vested options.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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- Definition

The number of shares purchased on the open market during the period for issuance to employees under the plan.

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