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Number of non-qualified stock options shares to purchase under the plan.

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The value of non-qualified stock options shares to purchase under the plan.

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The percentage of the value of non-qualified shares to purchase under the plan.

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Discount rate of common stock on closing price.

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Number of restricted units.

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Share-based Compensation Arrangement by Share-based Payment Award, Increase in Number of Shares Available for Grant

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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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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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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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

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

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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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The number of shares issued during the period upon the conversion of units. An example of a convertible unit is an umbrella partnership real estate investment trust unit (UPREIT unit).

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Capital Stock and Stock-Based Awards (Details) - USD ($)		12 Months Ended			49 Months Ended
	Sep. 21, 2016	May 31, 2017	May 31, 2016	May 31, 2015	Sep. 30, 2011	Jul. 31, 2016	Sep. 24, 2014	Sep. 30, 2007
Capital Stock and Stock-Based Awards (Details) [Line Items]
Preferred stock issued		0	0
Options outstanding (Shares)		2,693,824	3,025,046
Options granted (Shares)		522,761
Weighted average exercise price of options granted (in Dollars per share)		$ 39.39
Stock option compensation cost not yet recognized		$ 3,000,000
Future period of stock option expense recognition		2 years
Stock-based compensation cost		$ 10,100,000	$ 9,700,000	$ 11,300,000
Amended 2007 Directors Plan [Member]
Capital Stock and Stock-Based Awards (Details) [Line Items]
Options granted (Shares)	14,784
Weighted average exercise price of options granted (in Dollars per share)	$ 38.56
Restricted stock outstanding	7,623
Non qualified stock options to purchase (in Dollars)						$ 70,000
2001 Plan [Member]
Capital Stock and Stock-Based Awards (Details) [Line Items]
Options outstanding (Shares)		185,212
Plan 2011 [Member]
Capital Stock and Stock-Based Awards (Details) [Line Items]
Increase in number of shares available for grant							2,475,000
Options outstanding (Shares)		2,110,766
Options granted (Shares)		507,977
Weighted average exercise price of options granted (in Dollars per share)		$ 39.42
Common Stock Remaining Authorized Under EmployeeS tock Purchase Plan		1,397,818
2007 Directors’ Plan [Member]
Capital Stock and Stock-Based Awards (Details) [Line Items]
Options outstanding (Shares)		153,340
Non-qualified stock options outstanding								3,000
Restricted stock outstanding					1,200
Employee Stock Option [Member] \| Amended 2007 Directors Plan [Member]
Capital Stock and Stock-Based Awards (Details) [Line Items]
Non qualified stock options to purchase, Portion						40.00%
Restricted Stock Units (RSUs) [Member]
Capital Stock and Stock-Based Awards (Details) [Line Items]
Stock option compensation cost not yet recognized		$ 1,600,000
Future period of stock option expense recognition		1 year 7 months 6 days
Common stock issued from conversion of RSUs		37,791
Restricted Stock Units (RSUs) [Member] \| Amended 2007 Directors Plan [Member]
Capital Stock and Stock-Based Awards (Details) [Line Items]
Non qualified stock options to purchase, Portion						60.00%
Class A Stock Options [Member]
Capital Stock and Stock-Based Awards (Details) [Line Items]
Options outstanding (Shares)		244,506
Common Stock Remaining Authorized Under EmployeeS tock Purchase Plan		0
Employee Stock Purchase Plan [Member]
Capital Stock and Stock-Based Awards (Details) [Line Items]
Common Stock Remaining Authorized Under EmployeeS tock Purchase Plan		520,469
Quarterly basis discount rate of common stock on closing price		15.00%
Management Stock Purchase Plan [Member]
Capital Stock and Stock-Based Awards (Details) [Line Items]
Common Stock Remaining Authorized Under EmployeeS tock Purchase Plan		334,744
Stock option compensation cost not yet recognized		$ 100,000
Future period of stock option expense recognition		1 year 8 months 12 days
Deferred rate for annual cash bonus payment		100.00%
Quarterly basis discount rate of common stock on closing price		25.00%
Fair value of shares vested			$ 3,400,000	3,300,000
Stock Units And Restricted Stock Units [Member]
Capital Stock and Stock-Based Awards (Details) [Line Items]
Fair value of shares vested		$ 2,100,000
Discontinued Operations [Member]
Capital Stock and Stock-Based Awards (Details) [Line Items]
Stock-based compensation cost				$ 2,500,000