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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 |  |  |  |

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