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Stockholders' Equity (Details Textual) (USD $) | 12 Months Ended |  |  | 0 Months Ended |  | 12 Months Ended | 0 Months Ended | 12 Months Ended |  | 12 Months Ended
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May 31, 2014 OptionPlan | May 31, 2013 | May 31, 2012 | Oct. 05, 2011 | Feb. 27, 2004 | May 22, 2012 Avista Capital Partners [Member] | May 31, 2014 Avista Capital Partners [Member] | May 31, 2014 Performance Share and Restricted Stock Unit Awards [Member] | May 31, 2013 Performance Share and Restricted Stock Unit Awards [Member] | May 31, 2012 Performance Share and Restricted Stock Unit Awards [Member] | May 31, 2014 1997 Stock Option Plan [Member] | Oct. 05, 2011 2004 Stock and Incentive Award Plan [Member] | May 31, 2014 2004 Stock and Incentive Award Plan [Member] | May 31, 2014 2004 Stock and Incentive Award Plan [Member] Maximum [Member] | May 31, 2014 Employee Stock Purchase Plan [Member] Employees | May 31, 2013 Employee Stock Purchase Plan [Member] | May 31, 2012 Employee Stock Purchase Plan [Member]
Other Ownership Interests [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized capital stock |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock | 45,000,000 | 45,000,000 |  |  | 45,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value | $ 0.01 | $ 0.01 |  |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized | 5,000,000 | 5,000,000 |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value | $ 0.01 | $ 0.01 |  |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |
Voting common stock, par value |  |  |  |  | $ 1 |  |  |  |  |  |  |  |  |  |  |  |
Non-voting common stock, par value |  |  |  |  | $ 1 |  |  |  |  |  |  |  |  |  |  |  |
Common stock, issued |  |  |  |  | 9,200 |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding |  |  |  |  | 9,200,000 |  |  |  |  |  |  |  |  |  |  |  |
Issuance of investment funds |  |  |  |  |  | 9,500,000 |  |  |  |  |  |  |  |  |  |  |
Common stock, outstanding shares, percentage |  |  |  |  |  |  | 27.00% |  |  |  |  |  |  |  |  |  |
Authorized the repurchase of common stock |  |  |  | $ 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of purchased shares | 0 | 0 | 142,305 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of common stock for treasury |  |  | (2,104,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation plans | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum number of shares to be offered | 5,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,200,000 |  |
Total number of common stock available to be issued |  |  |  |  |  |  |  |  |  |  | 1,497,674 |  | 1,600,000 | 800,000 | 423,895 |  |
Options exercisable period |  |  |  |  |  |  |  |  |  |  | 10 years |  | 10 years |  |  |  |
Total number of common stock reserved for issuance |  |  |  |  |  |  |  |  |  |  |  |  | 5,750,000 |  |  |  |
Incentive award plan to increase the minimum number of shares |  |  |  |  |  |  |  |  |  |  |  | 200,000 |  |  |  |  |
Incentive award plan to increase the maximum number of shares |  |  |  |  |  |  |  |  |  |  |  | 500,000 |  |  |  |  |
Percentage of grants to employees vesting | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option grants to employees vesting period | 4 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of grants for consultants vesting | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option grants to consultants vesting period | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Initial grants to directors vesting | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial grants to directors vesting period | 4 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent grants for directors vesting | 33.33% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent grants for directors vesting period | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The total intrinsic value of options exercised | 1,000,000 | 100,000 | 2,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total fair value of restricted stock awards vesting |  |  |  |  |  |  |  | 1,800,000 | 1,200,000 | 900,000 |  |  |  |  |  |  |
Unrecognized compensation cost for stock options | 12.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share purchase periods |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |
Duration of purchase of shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 months |  |
Employee eligible in participating in offering period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 months |  |
Working schedule of employee to participate in offering period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 or more hours per week and more than five months in a calendar year |  |
Employees ownership threshold |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |
Percentage of fair market value of a share of common stock on the first day of the offering period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 85.00% |  |
Percentage of fair market value of a share of common stock on the last day of the offering period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 85.00% |  |
Maximum number of shares to be offered under the Stock Purchase Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 146,275 | 123,556 | 103,362
Average price of share issued | $ 9.30 | $ 9.80 | $ 11.62 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock based compensation pre tax amount | 5,422,000 | 4,609,000 | 4,090,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock based compensation after tax amount | $ 3,765,000 | $ 3,069,000 | $ 2,704,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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