Accounting for Stock-Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Aug. 31, 2011 year	Aug. 31, 2010 year
Stock options
Accounting for Stock-Based Compensation
Expiration term of awards (in years)	ten years
Number of equal annual increments in which stock options are exercisable	three, four or five
Commencement period after the date of grant for the stock options to be exercisable (in years)	1
Weighted average fair value of stock options granted (in dollars per share)	$ 11.80	$ 7.94
Assumptions used in the Black-Scholes option pricing models to estimate the fair value of each stock option grant
Risk-free interest rate (as a percent)	1.50%	1.90%
Expected volatility of common stock (as a percent)	45.70%	47.00%
Dividend yield (as a percent)	1.00%	0.00%
Expected option term (in years)	5.7	5.8
Number of Options
Outstanding at the beginning of the period (in shares)	1,994,000
Granted (in shares)	157,281	691,471
Exercised (in shares)	(332,000)
Cancelled (in shares)	(31,000)
Outstanding at the end of the period (in shares)	1,788,000
Exercisable at the end of the period (in shares)	866,000
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 18.56
Granted (in dollars per share)	$ 29.30
Exercised (in dollars per share)	$ 20.03
Cancelled (in dollars per share)	$ 17.11
Outstanding at the end of the period (in dollars per share)	$ 19.66
Exercisable at the end of the period (in dollars per share)	$ 18.28
Weighted Average Remaining Contractual Life (in years)
Outstanding at the end of the period (in years)	6.9
Exercisable at the end of the period (in years)	4.4
Aggregate Intrinsic Value
Outstanding at the end of the period	$ 11,362
Exercisable at the end of the period	6,427
Stock options, additional disclosures
Total fair value of stock options vested	3,720	2,275
Total intrinsic value of stock options exercised	3,323	4
Tax benefit realized from stock options exercised	639	1
Share-based compensation costs
Compensation expense	1,099	888
Unearned compensation not yet recognized	7,170
Average remaining amortization period of unearned compensation (in years)	1.4
Restricted shares
Share-based compensation costs
Compensation expense	1,518	1,735
Unearned compensation not yet recognized	$ 25,373
Average remaining amortization period of unearned compensation (in years)	2.7
Number of Shares
Unvested at the beginning of the period (in shares)	1,374,000
Granted (in shares)	598,000
Vested (in shares)	(324,000)
Forfeited (in shares)	(49,000)
Unvested at the end of the period (in shares)	1,599,000
Weighted Average Fair Value on Grant Date
Unvested at the beginning of the period (in dollars per share)	$ 23.06
Granted (in dollars per share)	$ 23.99
Vested (in dollars per share)	$ 26.71
Forfeited (in dollars per share)	$ 24.54
Unvested at the end of the period (in dollars per share)	$ 22.61
Restricted shares \| Board of Directors
Number of Shares
Granted (in shares)	45,000

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Number of share options (or share units) exercised during the current period.

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