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Other expense (income) - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Dec. 27, 2014
Dec. 28, 2013
Components of Other Income (Expense) [Line Items]        
Other expense (income) $ 150,000us-gaap_OtherNonoperatingIncomeExpense $ 0us-gaap_OtherNonoperatingIncomeExpense $ (1,396,000)us-gaap_OtherNonoperatingIncomeExpense $ 0us-gaap_OtherNonoperatingIncomeExpense