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Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
May 31, 2013 | May 31, 2012 | May 31, 2011
Revenue: |  |  |
Rental uniforms and ancillary products | $ 3,044,587 | $ 2,912,261 | $ 2,692,248
Other services | 1,271,884 | 1,189,739 | 1,118,136
Total revenue | 4,316,471 | 4,102,000 | 3,810,384
Costs and expenses: |  |  |
Cost of rental uniforms and ancillary products | 1,756,297 | 1,648,551 | 1,530,456
Cost of other services | 773,107 | 714,841 | 670,641
Selling and administrative expenses | 1,221,856 | 1,198,981 | 1,168,944
Operating income | 565,211 | 539,627 | 440,343
Interest income | (409) | (1,942) | (2,030)
Interest expense | 65,712 | 70,625 | 49,704
Income before income taxes | 499,908 | 470,944 | 392,669
Income taxes | 184,466 | 173,307 | 145,680
Net income | $ 315,442 | $ 297,637 | $ 246,989
Basic earnings per share (dollars per share) | $ 2.53 | $ 2.27 | $ 1.68
Diluted earnings per share (dollars per share) | $ 2.52 | $ 2.27 | $ 1.68
Dividends declared and paid per share (dollars per share) | $ 0.64 | $ 0.54 | $ 0.49

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- Definition The aggregate costs related to the sale of and servicing of other services such as uniform direct sales, first aid, safety and fire protection services and document management services, including the costs of the products and the costs of the services rendered during the reporting period. + References No definition available. + Details
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