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Bank Indebtedness - Additional Information (Detail) | 12 Months Ended |  |  |  |  | 12 Months Ended |  | 12 Months Ended |
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Mar. 30, 2013 USD ($) | Mar. 30, 2013 CAD | Mar. 31, 2012 USD ($) | Feb. 10, 2013 USD ($) | Jan. 20, 2013 USD ($) | Aug. 31, 2012 | Mar. 31, 2012 Prior to amendment [Member] | Mar. 31, 2012 After Amendment [Member] USD ($) | Mar. 30, 2013 Minimum [Member] | Mar. 31, 2012 Minimum [Member] | Mar. 30, 2013 Maximum [Member] | Mar. 31, 2012 Maximum [Member] | Mar. 31, 2012 Tranche A [Member] Minimum [Member] Prior to amendment [Member] | Mar. 31, 2012 Tranche A [Member] Maximum [Member] Prior to amendment [Member] | Mar. 31, 2012 Tranche B [Member] Minimum [Member] After Amendment [Member] | Mar. 31, 2012 Tranche B [Member] Maximum [Member] After Amendment [Member] | Mar. 31, 2012 Senior secured revolving credit facility [Member] USD ($) | Mar. 31, 2012 Senior secured revolving credit facility [Member] Senior secured credit facility extended revolving [Member] USD ($) | Mar. 31, 2012 Senior secured revolving credit facility [Member] Tranche A [Member] USD ($) | Mar. 31, 2012 Senior secured revolving credit facility [Member] Tranche B [Member] USD ($) | Mar. 31, 2012 Senior secured term loan credit facility [Member] USD ($)
Credit Facilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 132,000,000 | $ 115,000,000 | $ 124,000,000 | $ 12,500,000 | $ 12,500,000
Amendment Description |  |  | The $132 million senior secured revolving credit facility was amended and extended for a total of $115 million and bears interest at a floating rate of LIBOR plus 2.25% to LIBOR plus 3.0% (based on interest coverage and excess availability thresholds). |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Facility Interest rate-Fixed percentage added to LIBOR |  |  |  |  |  |  |  |  |  | 2.25% |  | 3.00% | 2.50% | 3.00% | 4.50% | 5.00% |  |  |  |  |
Interest rate reduced on senior secured term loan |  |  |  |  |  | 9.50% | 16.00% | 11.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 6.50% | 12.00% | 8.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Long Term Debt |  |  |  |  |  |  |  | 18,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility Expiration Date |  |  | Jun. 30, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior secured revolving credit facility which had an outstanding balance | 67,300,000 |  | 61,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discretionary reserve limit | 5.00% | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior secured revolving credit facility, seasonal availability block |  |  |  | 5,000,000 | 12,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior secured revolving credit facility, increase or decrease in the amount of excess availability | 369,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior secured revolving credit facility, excess availability | 16,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign exchange | 1.00 | 1.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate dividend payment |  |  |  |  |  |  |  |  |  |  | 33.00% |  |  |  |  |  |  |  |  |  |
Fixed charge coverage ratio |  |  |  |  |  |  |  |  | 1.00 |  | 1.30 |  |  |  |  |  |  |  |  |  |
Minimum excess availability | 30,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage on moveable property (general) under the Civil Code (Quebec) | $ 246,160,000 | 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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