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SHAREHOLDERS’ EQUITY (Details) - USD ($) |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 23, 2016 | Apr. 26, 2016 | Apr. 25, 2016 | Apr. 10, 2015 | Oct. 07, 2013 | May 31, 2016 | May 31, 2015 | May 31, 2014
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Stock repurchase program, remaining authorized repurchase amount |  |  |  |  |  | $ 266,900,000 |  |
ASR program, authorized amount |  |  | $ 50,000,000 | $ 100,000,000 | $ 100,000,000 |  |  |
Repurchase of common stock (in shares) |  | 545,777 |  | 1,955,730 | 3,200,000 | 673,212.000 |  |
Accelerated share repurchases, final price paid per share (in dollars per share) |  |  |  | $ 51.13 | $ 30.48 | $ 74.27 |  |
Stock repurchased and retired, value |  |  |  |  |  | $ 135,954,000 | $ 369,082,000 | $ 455,046,000
Stock repurchase program, estimated stock repurchase and retirement, in next period |  |  |  |  | $ 100,000,000.0 |  |  |
Other Than Accelerated Share Repurchase Program |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Repurchase of common stock (in shares) |  |  |  |  |  | 1,500,000 | 7,000,000 | 12,400,000
Stock repurchased and retired, value |  |  |  |  |  | $ 85,900,000 | $ 269,000,000 | $ 355,000,000
Treasury stock acquired, average cost per share (in dollars per share) |  |  |  |  |  | $ 58.12 | $ 38.19 | $ 28.65
Subsequent Event |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Repurchase of common stock (in shares) | 127,435 |  |  |  |  |  |  |

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- Definition Final price paid per share for the purchase of the targeted number of shares, determined by an average market price over a fixed period of time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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