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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