Assets and Liabilities Carried at Fair Value and Measured on Recurring Basis (Detail) - USD ($)
$ in Thousands |
Apr. 30, 2017 |
Jul. 31, 2016 |
Apr. 30, 2016 |
Jul. 31, 2015 |
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Cash and cash equivalents |
$ 158,633
|
$ 118,697
|
$ 128,124
|
$ 123,800
|
| Fair Value, Measurements, Recurring |
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Cash and cash equivalents |
158,600
|
118,700
|
|
|
| Plan assets for deferred compensation |
6,700
|
5,900
|
|
|
| Total assets at fair value |
165,300
|
124,600
|
|
|
| Contingent consideration |
|
12,200
|
|
|
| Foreign currency forward contracts |
500
|
300
|
|
|
| Total liabilities at fair value |
500
|
12,500
|
|
|
| Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) |
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Cash and cash equivalents |
158,600
|
118,700
|
|
|
| Plan assets for deferred compensation |
6,700
|
5,900
|
|
|
| Total assets at fair value |
165,300
|
124,600
|
|
|
| Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Foreign currency forward contracts |
500
|
300
|
|
|
| Total liabilities at fair value |
$ 500
|
300
|
|
|
| Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Contingent consideration |
|
12,200
|
|
|
| Total liabilities at fair value |
|
$ 12,200
|
|
|