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Acquisitions (Details) (USD $) In Thousands, unless otherwise specified |  |  |  | 0 Months Ended |  |  |  | 0 Months Ended |  | 0 Months Ended |  |
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May 31, 2014 | May 31, 2013 | May 31, 2012 | Feb. 01, 2013 Microsulis Medical Ltd [Member] | May 31, 2014 Microsulis Medical Ltd [Member] | Dec. 31, 2013 Microsulis Medical Ltd [Member] | Feb. 01, 2013 Microsulis Medical Ltd [Member] | May 22, 2012 Navilyst [Member] | May 22, 2012 Navilyst [Member] | Oct. 15, 2012 Vortex Medical [Member] | May 31, 2014 Vortex Medical [Member] | Oct. 15, 2012 Vortex Medical [Member]
Summary of estimated fair values of the assets acquired and liabilities assumed |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  | $ 7,683 |  |  | $ 339
Accounts receivable |  |  |  |  |  |  | 364 |  | 19,069 |  |  | 203
Prepaid expenses and other current assets |  |  |  |  |  |  | 443 |  | 5,504 |  |  | 7
Inventories |  |  |  |  |  |  | 687 |  | 26,851 |  |  | 488
Fixed assets |  |  |  |  |  |  | 1,906 |  | 34,017 |  |  |
Deferred tax assets |  |  |  |  |  |  |  |  | 34,209 |  |  | 1,307
Intangibles |  |  |  |  |  |  | 12,500 |  | 107,100 |  |  | 72,430
Other long-term assets |  |  |  |  |  |  |  |  | 497 |  |  |
Goodwill | 360,294 | 355,458 | 308,912 |  | 19,284 |  | 19,284 |  | 144,705 |  | 29,519 | 29,519
Total assets acquired |  |  |  |  |  |  | 35,184 |  | 379,635 |  |  | 104,293
Deferred tax liabilities |  |  |  |  |  |  |  |  |  |  |  | (28,340)
Liabilities assumed |  |  |  |  |  |  | (1,634) |  | (18,287) |  |  | (661)
Total purchase price |  |  |  |  |  |  | 33,550 |  | 361,348 |  |  | 75,292
Cash payment at closing |  |  |  | 10,566 |  |  |  | 97,000 |  | 15,105 |  |
Cash payment for initial investment |  |  |  |  |  | 5,000 | 5,000 |  |  |  |  |
Working capital adjustment |  |  |  |  |  |  |  |  |  | (115) |  |
Present value of deferred payment |  |  |  |  |  |  | 4,820 |  |  |  |  |
Present value of contingent consideration liability |  |  |  | 13,164 |  |  |  |  |  | 60,302 |  |
Total purchase price |  |  |  | $ 33,550 |  |  |  | $ 361,000 |  | $ 75,292 |  |

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