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Consolidated Financial Statements - Additional Information (Detail) $ in Thousands |  | 3 Months Ended | 6 Months Ended | 35 Months Ended
--- | --- | --- | --- | ---
Sep. 19, 2013 USD ($) | Nov. 30, 2015 USD ($) | Nov. 30, 2014 USD ($) | Nov. 30, 2015 USD ($) | Nov. 30, 2014 USD ($) | Nov. 30, 2015 USD ($)
Recent Developments [Line Items] |  |  |  |  |  |
Medical device excise tax |  | $ 978 | $ 1,076 | $ 1,981 | $ 2,071 | $ 11,600
Ratio for debt service coverage | 1.35 |  |  |  |  |
Ratio of indebtedness to consolidated EBITDA | 3.75 |  |  |  |  |
New Credit Agreement [Member] |  |  |  |  |  |
Recent Developments [Line Items] |  |  |  |  |  |
Percentage of increase in interest | 2.00% |  |  |  |  |
New Credit Agreement [Member] | Term Loan Facility [Member] |  |  |  |  |  |
Recent Developments [Line Items] |  |  |  |  |  |
Senior secured term loan facility | $ 100,000 |  |  |  |  |
Term loan quarterly repayment, year one | 5.00% |  |  |  |  |
Term loan quarterly repayment, year two | 5.00% |  |  |  |  |
Term loan quarterly repayment, year three | 10.00% |  |  |  |  |
Term loan quarterly repayment, year four | 15.00% |  |  |  |  |
Term loan quarterly repayment, year five | 65.00% |  |  |  |  |
New Credit Agreement [Member] | Senior Secured Revolving Credit Facility [Member] |  |  |  |  |  |
Recent Developments [Line Items] |  |  |  |  |  |
Senior secured term loan facility | $ 100,000 |  |  |  |  |
New Credit Agreement [Member] | Senior Secured Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |  |
Recent Developments [Line Items] |  |  |  |  |  |
Commitment fee, percentage | 0.20% |  |  |  |  |
New Credit Agreement [Member] | Senior Secured Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |  |
Recent Developments [Line Items] |  |  |  |  |  |
Commitment fee, percentage | 0.35% |  |  |  |  |
New Credit Agreement [Member] | Letters of Credit [Member] |  |  |  |  |  |
Recent Developments [Line Items] |  |  |  |  |  |
Senior secured term loan facility | $ 20,000 |  |  |  |  |
New Credit Agreement [Member] | Swingline Loans [Member] |  |  |  |  |  |
Recent Developments [Line Items] |  |  |  |  |  |
Senior secured term loan facility | 5,000 |  |  |  |  |
New Credit Agreement [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Recent Developments [Line Items] |  |  |  |  |  |
Initial amount borrowed under revolving facility | $ 41,400 |  |  |  |  |
New Credit Agreement [Member] | Base Rate [Member] | JP Morgan Chase [Member] |  |  |  |  |  |
Recent Developments [Line Items] |  |  |  |  |  |
Percentage of increases leverage ratio base rate, minimum | 0.50% |  |  |  |  |
Percentage of increases leverage ratio base rate, maximum | 1.25% |  |  |  |  |
New Credit Agreement [Member] | Eurodollar [Member] | JP Morgan Chase [Member] |  |  |  |  |  |
Recent Developments [Line Items] |  |  |  |  |  |
Percentage of increases leverage ratio base rate, minimum | 1.50% |  |  |  |  |
Percentage of increases leverage ratio base rate, maximum | 2.25% |  |  |  |  |
Trademarks [Member] |  |  |  |  |  |
Recent Developments [Line Items] |  |  |  |  |  |
Trademark impairment |  |  |  | $ 6,400 |  |

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