Credit Agreement - Additional Information (Detail)				12 Months Ended
	Jun. 28, 2012 USD ($)	Mar. 19, 2012 USD ($) shares	Mar. 19, 2012 USD ($) $ / shares	Dec. 31, 2015 USD ($)	Jul. 31, 2015 USD ($)	May. 31, 2015 USD ($)	May. 31, 2014 USD ($)
Line of Credit Facility [Line Items]
Grant of common stock to investment bank acting as advisor (in shares) | shares		215,000
Value of granted shares to investment bank			$ 2,800,000
Excess cash flow for prepayment of debt						$ 7,000,000	$ 11,500,000
Capitalized debt issuance cost	$ 800,000	$ 5,000,000	$ 5,000,000
Payments to third parties for legal and other services	0
Grant of shares based on price (in dollars per share) | $ / shares			$ 13
Accumulated amortization of debt issuance costs				$ 4,300,000
Credit Agreement
Line of Credit Facility [Line Items]
Recapitalized amount under credit agreement		147,500,000.0	$ 147,500,000.0
Term B Loan
Line of Credit Facility [Line Items]
Recapitalized amount under credit agreement	19,500,000.0	79,500,000.0	79,500,000.0	$ 78,400,000
Interest rate (as a percent)				7.25%
Quarterly payments of principal				$ 200,000.0
Expiry date of line of credit				Mar. 19, 2018
Term B Loan | Prime Rate Plus
Line of Credit Facility [Line Items]
Floor rate (as a percent)				2.50%
Basis spread on variable rate (as a percent)				4.75%
Term B Loan | LIBOR Plus
Line of Credit Facility [Line Items]
Floor rate (as a percent)				1.50%
Basis spread on variable rate (as a percent)				5.75%
Term B Loan | Series A Preferred Stock
Line of Credit Facility [Line Items]
Fees paid in conjunction with the credit agreement		800,000	800,000
Agent fee to an entity associated with majority stockholders	$ 200,000
Term A, Term B and revolving credit facility
Line of Credit Facility [Line Items]
Agent fee to an entity associated with majority stockholders			1,500,000
Term A Loan
Line of Credit Facility [Line Items]
Recapitalized amount under credit agreement		57,000,000.0	57,000,000.0	$ 15,900,000
Interest rate (as a percent)				6.75%
Quarterly payments of principal				$ 2,100,000.0
Expiry date of line of credit				Mar. 19, 2017
Term A Loan | Prime Rate Plus
Line of Credit Facility [Line Items]
Floor rate (as a percent)				2.50%
Basis spread on variable rate (as a percent)				4.25%
Term A Loan | LIBOR Plus
Line of Credit Facility [Line Items]
Floor rate (as a percent)				1.50%
Basis spread on variable rate (as a percent)				5.25%
Revolving credit facility
Line of Credit Facility [Line Items]
Recapitalized amount under credit agreement		$ 11,000,000.0	$ 11,000,000.0
Line of Credit
Line of Credit Facility [Line Items]
Interest rate (as a percent)				6.75%
Borrowing under line of credit, maximum				$ 11,000,000
Facility commitment fee (as a percent)				0.50%
Letter of credit outstanding				$ 2,000,000
Remaining borrowing capacity under the line of credit				$ 9,000,000
Excess cash flow for prepayment of debt					$ 1,300,000
Line of Credit | Minimum
Line of Credit Facility [Line Items]
Fixed charge coverage ratio				1.2
Line of Credit | Maximum
Line of Credit Facility [Line Items]
Total debt to EBITDA ratio				3.25
Line of Credit | Prime Rate Plus
Line of Credit Facility [Line Items]
Basis spread on variable rate (as a percent)				4.25%
Line of Credit | LIBOR Plus
Line of Credit Facility [Line Items]
Basis spread on variable rate (as a percent)				5.25%