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Share-Based Compensation (Restricted Shares Activity) (Details) - Restricted Shares - $ / shares	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Shares
Outstanding, beginning of period (in shares)	362,300	437,500	421,300
Granted (in shares)	266,100	106,900	126,600
Vested and issued (in shares)	(155,600)	(154,400)	(104,800)
Forfeited (in shares)	(5,000)	(27,700)	(5,600)
Outstanding, end of period (in shares)	467,800	362,300	437,500
Vested, end of period (in shares)	69,800	76,600	69,600
Weighted-Average Grant-Date Fair Value
Outstanding, beginning of period, weighted-average grant-date fair value (in USD per share)	$ 22.74	$ 16.76	$ 11.01
Granted, weighted-average grant-date fair value (in USD per share)	42.41	33.33	30.19
Vested, weighted-average grant-date fair value (in USD per share)	18.31	13.37	9.98
Forfeited, weighted-average grant-date fair value (in USD per share)	39.61	21.45	15.11
Outstanding, end of period, weighted-average grant-date fair value (in USD per share)	35.22	22.74	16.76
Vested, end of period, weighted-average grant-date fair value (in USD per share)	$ 14.76	$ 11.62	$ 9.34

X

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Issued

+ References

No definition available.

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested, Number

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Exercise Price

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ 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)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ 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)(2)(iii)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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).

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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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