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Basis of Presentation, Business Description and Summary of Significant Accounting Policies (Details Textual) (USD $) Share data in Millions, unless otherwise specified | 0 Months Ended | 1 Months Ended | 12 Months Ended |  | 12 Months Ended | 0 Months Ended |  | 0 Months Ended | 12 Months Ended |  | 12 Months Ended
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Mar. 31, 2014 Observation | Sep. 24, 2012 Observation | Feb. 13, 2012 Observation | Feb. 10, 2012 Observation | Apr. 21, 2014 | Feb. 25, 2014 | Oct. 15, 2012 | Mar. 05, 2012 | May 31, 2014 Intangible_Asset Investment | May 31, 2013 Investment | May 31, 2012 | Jun. 30, 2012 | May 31, 2014 Clinical Devices, B.V. [Member] Trademark-NAMIC [Member] | May 22, 2012 Navilyst [Member] | May 31, 2014 Navilyst [Member] | May 22, 2012 Navilyst [Member] Trademark-NAMIC [Member] | May 31, 2014 Navilyst [Member] Trademark-NAMIC [Member] | May 31, 2014 RITA [Member] | May 31, 2014 Maximum [Member] | May 31, 2014 Minimum [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Costs for quality call to action program |  |  |  |  |  |  |  |  | $ 3,200,000 |  |  |  |  |  |  |  |  |  |  |
Number of observations | 3 | 5 | 6 | 12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of business days to provide response to FDA |  |  |  |  | 15 days | 15 days | 15 days | 15 days |  |  |  |  |  |  |  |  |  |  |  |
Short Term Investments Maturity Period |  |  |  |  |  |  |  |  | less than three months |  |  |  |  |  |  |  |  |  |  |
Investments in auction rate securities that failed auctions |  |  |  |  |  |  |  |  | 1,809,000 | 1,800,000 |  |  |  |  |  |  |  |  |  |
Number of investments |  |  |  |  |  |  |  |  | 2 | 2 |  |  |  |  |  |  |  |  |  |
Accounts receivables period due |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90 days | 30 days
Weighted average useful life |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  | 20 years | 3 years
Acquired intangible asset |  |  |  |  |  |  |  |  |  |  |  |  | 3,600,000 |  |  | 28,600,000 | 28,600,000 |  |  |
Number of Indefinite Lived Intangible Assets |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |
Restocking charge percentage |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  |
Undamaged product expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 months
Federal net operating losses, unutilized |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,500,000 |  |  | 15,800,000 |  |
Federal net operating losses, utilized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,100,000 |  |
Estimated net operating losses, prior to utilization |  |  |  |  |  |  |  |  | 13,000,000 |  |  |  |  |  | 13,000,000 |  |  | 13,600,000 |  |
Potential amount of undiscounted future contingent consideration |  |  |  |  |  |  |  |  | 78,100,000 |  |  |  |  |  |  |  |  |  |  |
Milestones associated with the contingent consideration |  |  |  |  |  |  |  |  | 51,100,000 |  |  |  |  |  |  |  |  |  |  |
Reflected in current portion of contingent consideration |  |  |  |  |  |  |  |  | 16,300,000 |  |  |  |  |  |  |  |  |  |  |
Interest expense on derivative financial instruments |  |  |  |  |  |  |  |  |  | 61,000 |  |  |  |  |  |  |  |  |  |
Notional amount of interest rate swap agreement |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate payments |  |  |  |  |  |  |  |  |  |  |  | 3.26% |  |  |  |  |  |  |  |
Stock-based compensation, options vested, percentage |  |  |  |  |  |  |  |  | 88.00% |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation, options forfeiture rate |  |  |  |  |  |  |  |  | 12.00% |  |  |  |  |  |  |  |  |  |  |
Dividend paid |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of diluted earnings per share |  |  |  |  |  |  |  |  | 2.3 | 2.9 | 2.3 |  |  |  |  |  |  |  |  |

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