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Capital Stock and Stock-Based Awards (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended | 49 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 21, 2015 | Dec. 31, 2015 | May 31, 2016 | May 31, 2015 | May 31, 2014 | Sep. 30, 2011 | Jul. 31, 2015 | Sep. 24, 2014 | Sep. 30, 2007
Capital Stock and Stock-Based Awards (Details) [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock issued |  |  | 0 | 0 |  |  |  |  |
Options outstanding (Shares) |  |  | 3,025,046 | 4,054,126 |  |  |  |  |
Options granted (Shares) |  |  | 474,819 |  |  |  |  |  |
Weighted average exercise price of options granted (in Dollars per share) |  |  | $ 43.09 |  |  |  |  |  |
Stock option compensation cost not yet recognized |  |  | $ 3,300,000 |  |  |  |  |  |
Future period of stock option expense recognition |  |  | 2 years |  |  |  |  |  |
Stock-based compensation cost |  |  | $ 9,700,000 | $ 11,300,000 | $ 9,300,000 |  |  |  |
Amended 2007 Directors Plan [Member] |  |  |  |  |  |  |  |  |
Capital Stock and Stock-Based Awards (Details) [Line Items] |  |  |  |  |  |  |  |  |
Options granted (Shares) | 12,033 | 1,464 |  |  |  |  |  |  |
Weighted average exercise price of options granted (in Dollars per share) | $ 43.56 | $ 41.05 |  |  |  |  |  |  |
Restricted stock outstanding | 6,748 | 818 |  |  |  |  |  |  |
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) |  |  | 420,152 |  |  |  |  |  |
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) |  |  | 1,942,003 |  |  |  |  |  |
Options granted (Shares) |  |  | 461,322 |  |  |  |  |  |
Weighted average exercise price of options granted (in Dollars per share) |  |  | $ 43.06 |  |  |  |  |  |
Common Stock Remaining Authorized Under EmployeeS tock Purchase Plan |  |  | 1,909,399 |  |  |  |  |  |
1997 Directors’ Plan [Member] |  |  |  |  |  |  |  |  |
Capital Stock and Stock-Based Awards (Details) [Line Items] |  |  |  |  |  |  |  |  |
Options outstanding (Shares) |  |  | 12,000 |  |  |  |  |  |
Options granted per grantee |  |  | 6,000 |  |  |  |  |  |
2007 Directors’ Plan [Member] |  |  |  |  |  |  |  |  |
Capital Stock and Stock-Based Awards (Details) [Line Items] |  |  |  |  |  |  |  |  |
Options outstanding (Shares) |  |  | 150,891 |  |  |  |  |  |
Common Stock Remaining Authorized Under EmployeeS tock Purchase Plan |  |  | 241,841 |  |  |  |  |  |
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 |  |  | $ 2,100,000 |  |  |  |  |  |
Future period of stock option expense recognition |  |  | 1 year 7 months 6 days |  |  |  |  |  |
Common stock issued from conversion of RSUs |  |  | 61,924 |  |  |  |  |  |
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) |  |  | 500,000 |  |  |  |  |  |
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 |  |  | 563,268 |  |  |  |  |  |
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 |  |  | 336,429 |  |  |  |  |  |
Stock option compensation cost not yet recognized |  |  | $ 100,000 |  |  |  |  |  |
Future period of stock option expense recognition |  |  | 1 year 3 months 18 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 |  |  |  | 3,300,000 | 5,000,000 |  |  |  |
Stock Units And Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |
Capital Stock and Stock-Based Awards (Details) [Line Items] |  |  |  |  |  |  |  |  |
Fair value of shares vested |  |  | $ 3,400,000 |  |  |  |  |  |
Discontinued Operations [Member] |  |  |  |  |  |  |  |  |
Capital Stock and Stock-Based Awards (Details) [Line Items] |  |  |  |  |  |  |  |  |
Stock-based compensation cost |  |  |  | $ 2,500,000 | $ 900,000 |  |  |  |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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