Securities - Additional Information (Detail) $ in Thousands |
Oct. 25, 2013
CAD
time_deposit
|
Oct. 28, 2015
CAD
|
Apr. 25, 2015
USD ($)
|
Oct. 24, 2014
CAD
|
|---|---|---|---|---|
| Schedule of Held-to-maturity Securities [Line Items] | ||||
| Number of time deposits invested | time_deposit | 3 | |||
| Total principal amount | CAD 110,000,000 | CAD 65,000,000 | CAD 45,000,000 | |
| Maturity value of time deposits | CAD 67,031,000 | CAD 45,436,000 | ||
| Short-term Investments [Member] | ||||
| Schedule of Held-to-maturity Securities [Line Items] | ||||
| Total principal amount | $ | $ 53,372 |