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Summary of Restructuring Accrual by Expense Category (Detail) - USD ($)
$ in Thousands
12 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Jul. 31, 2015
Restructuring Cost and Reserve [Line Items]      
Accrued restructuring, beginning balance $ 3,029 $ 1,528 $ 2,285
Restructuring charges 2,292 7,561 5,387
Restructuring adjustments (325) (140) (257)
Cash paid (4,776) (5,885) (5,640)
Non-cash adjustments (34) (35) (247)
Accrued restructuring, ending balance 186 3,029 1,528
Employee Related Expenses      
Restructuring Cost and Reserve [Line Items]      
Accrued restructuring, beginning balance 2,074 1,437 1,687
Restructuring charges 1,853 6,025 5,063
Restructuring adjustments (416) (108) (193)
Cash paid (3,357) (5,244) (4,949)
Non-cash adjustments (54) (36) (171)
Accrued restructuring, ending balance 100 2,074 1,437
Contractual Obligations      
Restructuring Cost and Reserve [Line Items]      
Accrued restructuring, beginning balance 955 91 598
Restructuring charges 439 1,536 324
Restructuring adjustments 91 (32) (64)
Cash paid (1,419) (641) (691)
Non-cash adjustments 20 1 (76)
Accrued restructuring, ending balance $ 86 $ 955 $ 91