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Period Following Director's Term In Which Stock Awards May Be Settled

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Share-based Compensation Arrangement by Share-based Payment Award, Award Exercisability Period, from Date of Grant

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Share-based Compensation Arrangement by Share-based Payment Award, Restricted Stock and Restricted Stock Units, Additional Disclosures [Abstract]

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Share-based Compensation Arrangement by Share-based Payment Award, Vested in Period, Total Fair Value

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Share-based Compensation Arrangement by Share-based Payment Award, Extension of Expiration Period

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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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.

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Unrecognized cost of unvested share-based compensation awards.

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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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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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

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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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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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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).

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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The highest quantity of shares an employee can purchase under the plan per period.

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Number of additional shares authorized for issuance under an established share-based compensation plan.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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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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No definition available.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The grant-date intrinsic value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Gross number of share options (or share units) granted during the period.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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No definition available.

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Percentage of vesting of share-based compensation awards.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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Share-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Thousands							1 Months Ended	12 Months Ended
	Nov. 14, 2016 $ / shares shares	Sep. 12, 2016 $ / shares shares	Aug. 02, 2016 shares	May 26, 2016 shares	May 09, 2016 $ / shares shares	May 31, 2014 shares	Jun. 30, 2014 shares	Mar. 31, 2017 USD ($) $ / shares shares	Mar. 31, 2016 USD ($) $ / shares shares	Mar. 31, 2015 USD ($) $ / shares shares	Aug. 04, 2014 director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase to plan term							10 years
Stock-based compensation costs \| $								$ 8,148	$ 9,954	$ 6,918
Tax benefit recognized from share-based compensation expense \| $								2,600	3,500	1,900
Share-based compensation expense, not yet recognized \| $								$ 7,900
Share-based compensation expense, not yet recognized, period for recognition								9 months 18 days
Total fair value of shares vested \| $								$ 6,000	$ 7,000	$ 4,700
Exercise of stock options (in shares)								126,800	348,000	386,300
Cash received from exercise of stock options \| $								$ 4,000	$ 6,700	$ 4,000
Income tax benefit realized from exercise of stock awards \| $								$ 900	$ 2,100	$ 2,200
Number of shares available for issuance under plan								2,400,000
Options granted, shares								264,300	208,200	317,900
Options granted, weighted-average exercise price (in USD per share) \| $ / shares								$ 55.86	$ 42.13	$ 33.54
Restricted Shares
Number of directors, board of directors \| director											6
Options
Options exercised, intrinsic value \| $								$ 3,200	$ 8,600	$ 9,300
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested in period (in shares)								94,718	155,603	154,418
Common stock units granted in period, shares			1,896		49,064			68,400	266,100	106,900
Award vesting period					3 years
Restricted Shares
Period following director's term In which stock awards may be settled								6 months
Granted, weighted-average grant-date fair value (in USD per share) \| $ / shares								$ 55.44	$ 42.41	$ 33.33
Restricted Stock Units (RSUs) \| Chief Financial Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock units granted in period, shares		5,012
Restricted Stock Units (RSUs) \| Executive Vice President
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock units granted in period, shares	2,664
Restricted Stock Units (RSUs) \| Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period								3 years
Restricted Stock Units (RSUs) \| Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock units granted in period, shares				346
Award vesting period								1 year
Restricted Stock Units (RSUs) \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period								3 years
Restricted Stock Units (RSUs) \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period								5 years
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise of stock options (in shares)								126,820,000	348,055,000	386,254,000
Options granted, shares					224,843
Award vesting period					3 years
Award vesting rights, percentage					33.30%
Expiration period					10 years
Grant date exercise price (in USD per share) \| $ / shares					$ 57.18
Restricted Shares
Granted, weighted-average grant-date fair value (in USD per share) \| $ / shares								$ 21.75	$ 17.24	$ 15.95
Stock Options \| Chief Financial Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted, shares		25,746
Award vesting period		3 years
Expiration period		10 years
Grant date exercise price (in USD per share) \| $ / shares		$ 47.39
Stock Options \| Chief Financial Officer \| Tranche 1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage		33.30%
Stock Options \| Executive Vice President
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted, shares	13,683
Award vesting period	3 years
Expiration period	10 years
Grant date exercise price (in USD per share) \| $ / shares	$ 50.06
Stock Options \| Executive Vice President \| Tranche 1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage	33.30%
Stock Options \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period								3 years
Stock Options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period								5 years
Options
Award exercisability period, from date of grant (not greater than)								10 years
2005 Long-term Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for grant								5,000,000.0
Number of additional shares authorized under plan (in shares)							1,800,000.0
Maximum number of shares awarded, per employee, annual						1,000,000	2,500,000.0