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Share Based Compensation (Summarizes information about fixed stock options outstanding) (Details)	12 Months Ended
	Mar. 31, 2018 $ / shares shares
Exercise Price Range One [Member]
Summarizes information about fixed stock options outstanding
Range of exercise price, lower limit	$ 11.76
Range of exercise price, upper limit	$ 46.99
Options outstanding, shares under option | shares	118,465
Options outstanding, weighted average remaining life	1 year 11 days
Options outstanding, weighted average exercise price	$ 35.97
Options exercisable, shares under option | shares	110,965
Options exercisable, weighted average exercise price	$ 35.36
Exercise Price Range Two [Member]
Summarizes information about fixed stock options outstanding
Range of exercise price, lower limit	47.00
Range of exercise price, upper limit	$ 48.28
Options outstanding, shares under option | shares	442,300
Options outstanding, weighted average remaining life	5 years 4 months 10 days
Options outstanding, weighted average exercise price	$ 47.26
Options exercisable, shares under option | shares	500
Options exercisable, weighted average exercise price	$ 47.30
Exercise Price Range Three [Member]
Summarizes information about fixed stock options outstanding
Range of exercise price, lower limit	48.29
Range of exercise price, upper limit	$ 57.25
Options outstanding, shares under option | shares	305,718
Options outstanding, weighted average remaining life	3 years 2 months 1 day
Options outstanding, weighted average exercise price	$ 53.19
Options exercisable, shares under option | shares	154,825
Options exercisable, weighted average exercise price	$ 52.67
Exercise Price Range Four [Member]
Summarizes information about fixed stock options outstanding
Range of exercise price, lower limit	57.26
Range of exercise price, upper limit	$ 75.76
Options outstanding, shares under option | shares	341,495
Options outstanding, weighted average remaining life	3 years 1 month 28 days
Options outstanding, weighted average exercise price	$ 62.48
Options exercisable, shares under option | shares	229,283
Options exercisable, weighted average exercise price	$ 61.34

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ 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 (g)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ 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 (c)(iii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ 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 (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ 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 (g)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ 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 (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ 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 (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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 (e)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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