Slicers (applies to each fact value in each table cell)

Reporting Entity [Axis]

0001586300 (http://www.sec.gov/CIK)

Inventory Disclosure [Abstract]	Period [Axis]
	2015-05-01 - 2016-04-30
Inventory Disclosure [Abstract]
Schedule of Inventory	2015   2016 Work-in-progress for long-term maintenance contracts under completed contract accounting $ 7,551   $ 5,749 Consumables 118,339   100,667 Provision for obsolete and excess inventories (8,142 )   (14,167 )   $ 117,748   $ 92,249