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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. 18, 2019	Sep. 26, 2018	Sep. 24, 2014	Jul. 31, 2019	May 31, 2020	May 31, 2019	May 31, 2018	Sep. 30, 2011	Sep. 30, 2017	Sep. 30, 2007
Capital Stock and Stock-Based Awards (Details) [Line Items]
Preferred stock issued					0	0
Options outstanding (Shares)					3,002,981	2,942,129
Options exercised (Shares)					26,326
Options granted (Shares)					125,563
Weighted average exercise price of options granted (in Dollars per share)					$ 32.12
Stock option compensation cost not yet recognized					$ 1,500
Future period of stock option expense recognition					2 years 1 month 6 days
Stock-based compensation cost					$ 3,800	$ 8,300	$ 10,700
2017 Outside Director's Stock Incentive Plan [Member]
Capital Stock and Stock-Based Awards (Details) [Line Items]
Shares reserved for issuance									400,000
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture				$ 90,000
Amended 2007 Directors Plan [Member]
Capital Stock and Stock-Based Awards (Details) [Line Items]
Options granted (Shares)	24,297
Weighted average exercise price of options granted (in Dollars per share)	$ 39.33
Restricted stock outstanding	9,604
Directors Plan 2017 [Member]
Capital Stock and Stock-Based Awards (Details) [Line Items]
Options outstanding (Shares)					62,088
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)					99,212
Plan 2011 [Member]
Capital Stock and Stock-Based Awards (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized		2,540,000	2,475,000
Increase in number of shares available for grant		7,115,000
Options outstanding (Shares)					2,749,287
Options granted (Shares)					101,266
Weighted average exercise price of options granted (in Dollars per share)					$ 30.38
Common stock remaining authorized under employee stock purchase plan					2,803,519
Granted (Shares)					11,316
2007 Directors’ Plan [Member]
Capital Stock and Stock-Based Awards (Details) [Line Items]
Options outstanding (Shares)					92,394
Non-qualified stock options outstanding										3,000
Restricted stock outstanding								1,200
Share-based Payment Arrangement, 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					$ 1,500
Future period of stock option expense recognition					2 years 4 months 24 days
Common stock issued from conversion of RSUs					43,248
Granted (Shares)					34,632	82,044	68,089
Employee Stock Purchase Plan [Member]
Capital Stock and Stock-Based Awards (Details) [Line Items]
Common stock remaining authorized under employee stock purchase plan					356,239
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					283,017
Stock option compensation cost not yet recognized					$ 0
Granted (Shares)					3,843	17,239	73,965
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						$ 2,700	$ 3,600
Stock Units And Restricted Stock Units [Member]
Capital Stock and Stock-Based Awards (Details) [Line Items]
Granted (Shares)					38,475
Fair value of shares vested					$ 2,800