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Fair Value - Summary Showing the Recurring Fair Value Measurements of the Contingent Consideration Liability (Detail) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Nov. 30, 2015 | May. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
November 30, 2014 | $ 37,849 | $ 47,384
Contingent Consideration Earn Out Liability [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fair value financial liabilities | 37,849 |
Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fair value financial liabilities | 37,946 | 47,641
Recurring [Member] | Contingent Consideration Earn Out Liability [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fair value financial liabilities |  | 47,384
Level 3 [Member] | Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fair value financial liabilities | 37,849 | 47,384
Level 3 [Member] | Recurring [Member] | Contingent Consideration Earn Out Liability [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fair value financial liabilities | 37,849 | $ 47,384
Level 3 [Member] | Revenue Based Payments [Member] | Recurring [Member] | Contingent Consideration Earn Out Liability [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
November 30, 2014 | $ 35,249 |
Level 3 [Member] | Revenue Based Payments [Member] | Minimum [Member] | Recurring [Member] | Contingent Consideration Earn Out Liability [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Discount rate | 4.00% |
Probability of payment | 75.00% |
Projected fiscal year of payment | 2015 |
Level 3 [Member] | Revenue Based Payments [Member] | Maximum [Member] | Recurring [Member] | Contingent Consideration Earn Out Liability [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Discount rate | 10.00% |
Probability of payment | 100.00% |
Projected fiscal year of payment | 2022 |
Level 3 [Member] | Milestone Based Payments [Member] | Recurring [Member] | Contingent Consideration Earn Out Liability [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
November 30, 2014 | $ 2,600 |
Level 3 [Member] | Milestone Based Payments [Member] | Minimum [Member] | Recurring [Member] | Contingent Consideration Earn Out Liability [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Discount rate | 16.00% |
Probability of payment | 75.00% |
Projected fiscal year of payment | 2015 |
Level 3 [Member] | Milestone Based Payments [Member] | Maximum [Member] | Recurring [Member] | Contingent Consideration Earn Out Liability [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Discount rate | 20.00% |
Probability of payment | 100.00% |
Projected fiscal year of payment | 2017 |

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