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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. 26, 2018	Sep. 21, 2016	Sep. 24, 2014	Jul. 31, 2017	May 31, 2019	May 31, 2018	May 31, 2017	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)					2,942,129	2,822,126
Options exercised (Shares)					214,273
Options granted (Shares)					358,369
Weighted average exercise price of options granted (in Dollars per share)					$ 42.77
Stock option compensation cost not yet recognized					$ 2,400
Future period of stock option expense recognition					2 years
Stock-based compensation cost					$ 8,300	$ 10,700	$ 10,100
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)		18,767
Weighted average exercise price of options granted (in Dollars per share)		$ 43.07
Restricted stock outstanding		8,771
Directors Plan 2017 [Member]
Capital Stock and Stock-Based Awards (Details) [Line Items]
Options outstanding (Shares)					37,511
2004 Class A Stock Incentive Plan [Member]
Capital Stock and Stock-Based Awards (Details) [Line Items]
Options outstanding (Shares)					0
Options exercised (Shares)					244,506
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)					99,976
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)					2,706,248
Options granted (Shares)					339,602
Weighted average exercise price of options granted (in Dollars per share)					$ 42.76
Common stock remaining authorized under employee stock purchase plan					2,869,821
2007 Directors’ Plan [Member]
Capital Stock and Stock-Based Awards (Details) [Line Items]
Options outstanding (Shares)					98,394
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					$ 2,100
Future period of stock option expense recognition					1 year 9 months 30 days
Common stock issued from conversion of RSUs					39,805
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					421,953
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					270,236
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						$ 3,600	$ 2,100
Stock Units And Restricted Stock Units [Member]
Capital Stock and Stock-Based Awards (Details) [Line Items]
Fair value of shares vested					$ 2,700