Retirement Plans - Additional Information (Detail) (USD $)	12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer contributions	$ 1,500,000	$ 1,600,000
Benefits and administrative expenses	54,147,000	52,527,000	51,753,000
Expected payments for fiscal year 2015	300,000
Defined Contribution Pension Plan 401k
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer matching contribution percentage of employee contributions of eligible compensation	4.00%
Company's contributions to the plan	5,200,000	4,900,000	4,500,000
Defined Contribution Pension Plan 401k | Minimum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Percentage employees may contribute of their eligible compensation to the plan	1.00%
Defined Contribution Pension Plan 401k | Maximum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Percentage employees may contribute of their eligible compensation to the plan	80.00%
Analogic Canada Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected to be amortized, net actuarial loss	200,000
Employer contributions	1,600,000	1,700,000	1,100,000
Benefits and administrative expenses	1,000,000	600,000	100,000
Analogic Canada Plan | General and Administrative
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected contributions for fiscal year 2015	900,000
Expected payments for fiscal year 2015	400,000
Analogic Canada Plan | Other Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
ABO balances	$ 12,800,000	$ 10,200,000