Share-Based Compensation - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended
Nov. 30, 2014	Nov. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding to officers, directors and key employees	1,100,000
Total number of shares cumulatively authorized to be issued under our stock incentive plans	7,120,000
Share-based compensation	$ 2.5	$ 2.2
Tax benefit related to share-based compensation	1.5	0.7
Employee service share-based compensation, nonvested awards, compensation not yet recognized, share-based awards other than options	13.1
Remaining weighted-average period	3 years
Weighted-average remaining contractual life of Options exercisable	2 years 2 months 12 days
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	0	0
Award vesting period	4 years
Stock option year term	10 years
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	0.3	0.3
Award vesting period	4 years
Stock And Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	2.1	1.9
Award vesting period	4 years
Long Term Performance Stock Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 0	$ 0
Performance Period	3 years
Service Period	3 years
Settlement period	20 days
Long Term Performance Stock Unit Awards \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Possible payouts	0.00%
Long Term Performance Stock Unit Awards \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Possible payouts	300.00%

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Performance Measurement Period

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Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Outstanding

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Percentage of vesting of share-based compensation awards.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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).

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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