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Stockholders' Equity (Details Textual) |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Nov. 06, 2016 USD ($) | Oct. 25, 2016 shares | Oct. 29, 2014 $ / shares shares | Feb. 28, 2017 USD ($) $ / shares shares | May 31, 2017 USD ($) $ / shares shares | Nov. 30, 2016 USD ($) shares | May 31, 2018 USD ($) working_hour Employees $ / shares shares | May 31, 2017 USD ($) $ / shares shares | May 31, 2016 USD ($) $ / shares shares | May 31, 2015 shares
Other Ownership Interests [Line Items] |  |  |  |  |  |  |  |  |  |
Authorized capital stock (shares) | shares |  |  | 80,000,000 |  |  |  |  |  |  |
Shares of common stock (shares) | shares |  |  | 75,000,000 |  | 75,000,000 |  | 75,000,000 | 75,000,000 |  |
Common stock, par value (usd per share) | $ / shares |  |  | $ 0.01 | $ 0.01 | $ 0.01 |  | $ 0.01 | $ 0.01 |  |
Preferred stock, shares authorized (shares) | shares |  |  | 5,000,000 |  | 5,000,000 |  | 5,000,000 | 5,000,000 |  |
Preferred stock, par value (usd per share) | $ / shares |  |  | $ 0.01 |  | $ 0.01 |  | $ 0.01 | $ 0.01 |  |
Common stock, votes per share |  |  | 1 |  |  |  |  |  |  |
Subsequent grants for directors vesting |  |  |  |  |  |  | 33.33% |  |  |
Subsequent grants for directors vesting period |  |  |  |  |  |  | 3 years |  |  |
Option grants in the period, weighted average grant date fair value (usd per share) | $ / shares |  |  |  |  |  |  | $ 4.95 | $ 4.70 | $ 4.16 |
Risk free interest rate |  |  |  |  |  |  | 2.08% | 1.30% | 1.48% |
Expected volatility rate |  |  |  |  |  |  | 30.00% | 31.00% | 31.00% |
Expected term |  |  |  |  |  |  | 4 years 8 months 20 days | 4 years 9 months 20 days | 4 years 9 months 21 days |
Dividends | $ |  |  |  |  |  |  | $ 0 | $ 0 | $ 0 |
The total intrinsic value of options exercised | $ |  |  |  |  |  |  | 700,000 | 2,800,000 | 100,000 |
Compensation not yet recognized | $ |  |  |  |  |  |  | 3,900,000 |  |  |
Proceeds from stock options exercised | $ |  |  |  |  |  |  | 2,000,000 | 9,900,000 | 1,300,000 |
Tax benefit | $ |  |  |  |  |  |  | $ 1,800,000 | $ 2,200,000 | $ 1,000,000 |
Grants in the period, weighted average grant date fair value (usd per share) | $ / shares |  |  |  |  |  |  |  | $ 16.54 | $ 15.21 |
Average price of share issued | $ / shares |  |  |  |  | $ 11.00 |  | $ 14.03 | $ 11.00 | $ 10.67 |
Common stock repurchased | $ |  |  |  |  |  |  |  | $ 13,557,000 |  |
Repurchase of common stock | $ |  |  |  |  | $ 5,700,000 |  | $ 0 | 13,557,000 | $ 0 |
Treasury stock retirement | $ |  |  |  |  |  |  |  | $ 0 |  |
Common Stock |  |  |  |  |  |  |  |  |  |
Other Ownership Interests [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum number of shares to be offered under the Stock Purchase Plan | shares |  |  |  |  |  |  | 89,943 | 129,185 | 137,957 |
Common stock repurchased (shares) | shares |  |  |  |  |  |  |  | 370,000 |  |
Common stock repurchased | $ |  |  |  |  |  |  |  | $ (3,000) |  |
Treasury stock retirement (shares) | shares |  |  |  | 642,305 |  |  |  | (642,305) |  |
Treasury stock retirement | $ |  |  |  | $ 9,900,000 |  |  |  | $ (2,000) |  |
Additional paid in capital |  |  |  |  |  |  |  |  |  |
Other Ownership Interests [Line Items] |  |  |  |  |  |  |  |  |  |
Treasury stock retirement | $ |  |  |  | $ 9,900,000 |  |  |  | (9,942,000) |  |
Common Stock |  |  |  |  |  |  |  |  |  |
Other Ownership Interests [Line Items] |  |  |  |  |  |  |  |  |  |
Share repurchases, authorized amount | $ | $ 25,000,000 |  |  |  |  |  |  |  |  |
Share repurchase program period | 24 months |  |  |  |  |  |  |  |  |
Common stock repurchased (shares) | shares |  |  |  |  |  | 500,000 |  |  |  |
Common stock repurchased | $ |  |  |  |  |  | $ 7,800,000 |  |  |  |
Share repurchases | shares |  |  |  |  | 370,000 |  |  |  |  |
Share repurchases, remaining shares | $ |  |  |  |  |  |  | $ 11,400,000 |  |  |
Employee Stock Option |  |  |  |  |  |  |  |  |  |
Other Ownership Interests [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of grants to employees vesting |  |  |  |  |  |  | 25.00% |  |  |
Option grants to employees vesting period |  |  |  |  |  |  | 4 years |  |  |
Period of recognition for costs not yet recognized |  |  |  |  |  |  | 4 years |  |  |
Tax benefit | $ |  |  |  |  |  |  | $ 0 | $ 0 | $ 100,000 |
Restricted Stock Units |  |  |  |  |  |  |  |  |  |
Other Ownership Interests [Line Items] |  |  |  |  |  |  |  |  |  |
Period of recognition for costs not yet recognized |  |  |  |  |  |  | 3 years |  |  |
Vesting percentage (as percent) |  |  |  |  |  |  | 25.00% |  |  |
Vesting period |  |  |  |  |  |  | 1 year |  |  |
Grants in the period, weighted average grant date fair value (usd per share) | $ / shares |  |  |  |  |  |  | $ 16.60 |  |  |
Employee service, compensation cost not yet recognized | $ |  |  |  |  |  |  | $ 5,100,000 |  |  |
Nonvested compensation, weighted average grant date fair value (usd per share) | $ / shares |  |  |  |  | $ 15.55 |  | $ 16.23 | $ 15.55 |  |
Nonvested compensation (shares) | shares |  |  |  |  | 439,297 |  | 474,502 | 439,297 |  |
Performance Share and Restricted Stock Unit Awards |  |  |  |  |  |  |  |  |  |
Other Ownership Interests [Line Items] |  |  |  |  |  |  |  |  |  |
Total fair value of restricted stock awards vesting | $ |  |  |  |  |  |  | $ 2,700,000 | $ 2,900,000 | $ 2,500,000 |
Performance Shares |  |  |  |  |  |  |  |  |  |
Other Ownership Interests [Line Items] |  |  |  |  |  |  |  |  |  |
Employee service, compensation cost not yet recognized | $ |  |  |  |  |  |  | $ 3,900,000 |  |  |
Nonvested compensation, weighted average grant date fair value (usd per share) | $ / shares |  |  |  |  | $ 22.61 |  | $ 23.83 | $ 22.61 | $ 18.07 |
Performance period |  |  |  |  |  |  | 3 years |  |  |
Nonvested compensation (shares) | shares |  |  |  |  |  |  | 500,000 |  |  |
Weighted average remaining contractual term |  |  |  |  |  |  | 2 years |  |  |
Employee Stock Option |  |  |  |  |  |  |  |  |  |
Other Ownership Interests [Line Items] |  |  |  |  |  |  |  |  |  |
Period of recognition for costs not yet recognized |  |  |  |  |  |  | 3 years |  |  |
2004 Stock and Incentive Award Plan |  |  |  |  |  |  |  |  |  |
Other Ownership Interests [Line Items] |  |  |  |  |  |  |  |  |  |
Total number of common stock reserved for issuance (shares) | shares |  |  |  |  |  |  | 7,000,000 |  |  |
Total number of common stock available to be issued (shares) | shares |  |  |  |  |  |  | 1,800,000 |  |  |
Options exercisable period |  |  |  |  |  |  | 10 years |  |  |
Incentive award plan to increase the minimum number of shares (shares) | shares |  | 250,000 |  |  |  |  |  |  |  |
2004 Stock and Incentive Award Plan | Maximum |  |  |  |  |  |  |  |  |  |
Other Ownership Interests [Line Items] |  |  |  |  |  |  |  |  |  |
Total number of common stock available to be issued (shares) | shares |  |  |  |  |  |  | 800,000 |  |  |
Stock Purchase Plan |  |  |  |  |  |  |  |  |  |
Other Ownership Interests [Line Items] |  |  |  |  |  |  |  |  |  |
Total number of common stock available to be issued (shares) | shares |  |  |  |  |  |  | 1,200,000.0 |  |  |
Maximum number of shares to be offered | shares |  |  |  |  |  |  | 2,500,000 |  |  |
Share purchase periods | Employees |  |  |  |  |  |  | 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 |  |  |
Number of working hours to be eligible (working hour) | working_hour |  |  |  |  |  |  | 20 |  |  |
Number of working months to be eligible |  |  |  |  |  |  | 5 months |  |  |
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% |  |  |
Number of additional shares reserved for issuance (shares) | shares |  |  |  |  |  |  |  | 500,000 |  | 800,000
Maximum number of shares to be offered under the Stock Purchase Plan | shares |  |  |  |  |  |  | 89,943 | 129,185 | 137,957 |

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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The highest quantity of shares an employee can purchase under the plan per period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average of per share prices paid for shares purchased on the open market for issuance to employees under the plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + Details
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- Definition Percentage of vesting of share-based compensation awards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 + Details
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- Definition Purchase price of common stock expressed as a percentage of its fair value. + References No definition available. + Details
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