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Capital Stock and Stock-Based Awards (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended | 49 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 21, 2016 | Jul. 31, 2017 | May 31, 2018 | May 31, 2017 | May 31, 2016 | Sep. 30, 2011 | Sep. 30, 2017 | Sep. 24, 2014 | Sep. 30, 2007
Capital Stock and Stock-Based Awards (Details) [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock issued |  |  | 0 | 0 |  |  |  |  |
Options outstanding (Shares) |  |  | 2,822,126 | 2,693,824 |  |  |  |  |
Options granted (Shares) |  |  | 717,851 |  |  |  |  |  |
Weighted average exercise price of options granted (in Dollars per share) |  |  | $ 38.79 |  |  |  |  |  |
Stock option compensation cost not yet recognized |  |  | $ 3,200 |  |  |  |  |  |
Future period of stock option expense recognition |  |  | 2 years |  |  |  |  |  |
Stock-based compensation cost |  |  | $ 10,700 | $ 10,100 | $ 9,700 |  |  |  |
2017 Outside Director's Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Capital Stock and Stock-Based Awards (Details) [Line Items] |  |  |  |  |  |  |  |  |
Shares reserved for issuance |  |  |  |  |  |  | 400,000 |  |
Stock Granted, Value, Share-based Compensation, Gross |  | $ 90 |  |  |  |  |  |  |
Amended 2007 Directors Plan [Member] |  |  |  |  |  |  |  |  |
Capital Stock and Stock-Based Awards (Details) [Line Items] |  |  |  |  |  |  |  |  |
Options granted (Shares) | 21,868 |  |  |  |  |  |  |  |
Weighted average exercise price of options granted (in Dollars per share) | $ 38.61 |  |  |  |  |  |  |  |
Restricted stock outstanding | 9,786 |  |  |  |  |  |  |  |
Restricted Stock [Member] | 2017 Outside Director's Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Capital Stock and Stock-Based Awards (Details) [Line Items] |  |  |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Stock Allocation Percentage |  | 60.00% |  |  |  |  |  |  |
2001 Plan [Member] |  |  |  |  |  |  |  |  |
Capital Stock and Stock-Based Awards (Details) [Line Items] |  |  |  |  |  |  |  |  |
Options outstanding (Shares) |  |  | 114,312 |  |  |  |  |  |
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) |  |  | 2,540,842 |  |  |  |  |  |
Options granted (Shares) |  |  | 695,983 |  |  |  |  |  |
Weighted average exercise price of options granted (in Dollars per share) |  |  | $ 38.79 |  |  |  |  |  |
Common stock remaining authorized under employee stock purchase plan |  |  | 701,551 |  |  |  |  |  |
2007 Directors’ Plan [Member] |  |  |  |  |  |  |  |  |
Capital Stock and Stock-Based Awards (Details) [Line Items] |  |  |  |  |  |  |  |  |
Options outstanding (Shares) |  |  | 21,868 |  |  |  |  |  |
Non-qualified stock options outstanding |  |  |  |  |  |  |  |  | 3,000
Restricted stock outstanding |  |  |  |  |  | 1,200 |  |  |
Employee Stock Option [Member] | 2017 Outside Director's Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Capital Stock and Stock-Based Awards (Details) [Line Items] |  |  |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Stock Allocation Percentage |  | 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 |  |  |  |  |  |
Future period of stock option expense recognition |  |  | 1 year 7 months 27 days |  |  |  |  |  |
Common stock issued from conversion of RSUs |  |  | 51,083 |  |  |  |  |  |
Class A Stock Options [Member] |  |  |  |  |  |  |  |  |
Capital Stock and Stock-Based Awards (Details) [Line Items] |  |  |  |  |  |  |  |  |
Common stock remaining authorized under employee stock purchase plan |  |  | 0 |  |  |  |  |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |  |  |
Capital Stock and Stock-Based Awards (Details) [Line Items] |  |  |  |  |  |  |  |  |
Common stock remaining authorized under employee stock purchase plan |  |  | 469,953 |  |  |  |  |  |
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 employee stock purchase plan |  |  | 260,779 |  |  |  |  |  |
Stock option compensation cost not yet recognized |  |  | $ 100 |  |  |  |  |  |
Future period of stock option expense recognition |  |  | 1 year |  |  |  |  |  |
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 |  |  |  | $ 2,100 | $ 3,400 |  |  |  |
Stock Units And Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |
Capital Stock and Stock-Based Awards (Details) [Line Items] |  |  |  |  |  |  |  |  |
Fair value of shares vested |  |  | $ 3,600 |  |  |  |  |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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