Restructuring Charges Related to Consolidation of Operations (Detail) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
May. 31, 2015 |
May. 31, 2014 |
May. 31, 2015 |
May. 31, 2014 |
Nov. 30, 2012 |
|
| Restructuring Cost and Reserve [Line Items] | |||||
| Restructuring charges | $ 840 | $ 748 | $ 1,670 | $ 866 | |
| EMS Restructuring | |||||
| Restructuring Cost and Reserve [Line Items] | |||||
| Restructuring charges | $ 591 | ||||
| Inventory write-down | 7,401 | ||||
| Fixed asset impairment | 865 | ||||
| Lease impairment | 3,672 | ||||
| Accumulated restructuring charges | $ 12,529 | ||||
| Cash payments | (591) | ||||
| Non-cash charges | (10,124) | ||||
| Balance - Lease impairment accrual | $ 1,814 | $ 1,814 | |||